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Issue 897387 link

Starred by 2 users

Issue metadata

Status: Fixed
Owner:
Closed: Nov 7
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 1
Type: Bug

Blocked on:
issue 901555

Blocking:
issue 905388
issue 897378



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Web contents eviction due to occlusion is causing jank in overview/tablet mode transition.

Project Member Reported by osh...@chromium.org, Oct 20

Issue description

I'll first add suspend/resume on occlusion tracker so that we can
avoid during overview/tablet mode transition where the unocclusion can happen to many windows at the same time.

We'll the look into other improvement sush as:
1) Do not discard last X pages. ChromeOS overview mode does allow a user to quickly switch tasks between top and second, and these pages shouldn't be discarded.

2) Show thumbnail/monochrome stale page while reloading. We already have a code that takes monochrome page for overscroll navigation, so we may be able to reuse the logic?
 
Blocking: 897378
I wrote a CL that is able to display a screenshot of a page https://chromium-review.googlesource.com/c/chromium/src/+/732038, but never landed it because I was told that instead of saving a PNG screenshot of a page, we could keep the frame alive in the GPU process. You may want to ask piman@ about that.
Cc: dcasta...@chromium.org piman@chromium.org
thanks, i'll file a separate bug for it.
Cc: samans@chromium.org fsam...@chromium.org
WindowOcclusionTracker already have an ability to pause, so all we need is to pause during the animation.
Project Member

Comment 6 by bugdroid1@chromium.org, Oct 31

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a9fdf9b70f437fe85f00d73d7879ba75af7e9159

commit a9fdf9b70f437fe85f00d73d7879ba75af7e9159
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Wed Oct 31 11:12:29 2018

Overview optimizations

* Pause occusion tracker during overview animation
* Activate the text filter after animation
* Don't animate backdrop window during overview animation.
* Fix the bounds change issue in WindowGrid. It shouldn't change
the parent window's bounds.

  in both clamshell and tabletmode.
  The web contents should load after animations without backdrop animation.
  No gap at the bottom of the screen after exiting overview mode.

Bug:  898077 ,  897387 
Test: no functional change. Manually tested visual change by entering/exiting overview mode
Change-Id: I60c2709c5394a565bae6d0c4bfdd7006e2e76496
Reviewed-on: https://chromium-review.googlesource.com/c/1304973
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604206}
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/overview/window_selector.cc
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/overview/window_selector.h
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/overview/window_selector_controller.cc
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/overview/window_selector_controller.h
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/workspace/backdrop_controller.cc
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/workspace/backdrop_controller.h
[modify] https://crrev.com/a9fdf9b70f437fe85f00d73d7879ba75af7e9159/ash/wm/workspace/workspace_layout_manager.cc

Project Member

Comment 7 by bugdroid1@chromium.org, Oct 31

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5dc1b34404597c461844ae64dbcf11ce6a14b8e1

commit 5dc1b34404597c461844ae64dbcf11ce6a14b8e1
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Wed Oct 31 22:50:16 2018

Revert "Overview optimizations"

This reverts commit a9fdf9b70f437fe85f00d73d7879ba75af7e9159.

Reason for revert: due to null reference. I'll revert and land new one with fix to make merge easier.

Original change's description:
> Overview optimizations
> 
> * Pause occusion tracker during overview animation
> * Activate the text filter after animation
> * Don't animate backdrop window during overview animation.
> * Fix the bounds change issue in WindowGrid. It shouldn't change
> the parent window's bounds.
> 
>   in both clamshell and tabletmode.
>   The web contents should load after animations without backdrop animation.
>   No gap at the bottom of the screen after exiting overview mode.
> 
> Bug:  898077 ,  897387 
> Test: no functional change. Manually tested visual change by entering/exiting overview mode
> Change-Id: I60c2709c5394a565bae6d0c4bfdd7006e2e76496
> Reviewed-on: https://chromium-review.googlesource.com/c/1304973
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#604206}

TBR=oshima@chromium.org,sammiequon@chromium.org

Change-Id: Ied4ce4d12abc962bffead6e22bbd7e2a837ad544
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  898077 ,  897387 
Reviewed-on: https://chromium-review.googlesource.com/c/1311793
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604430}
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/overview/window_selector.cc
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/overview/window_selector.h
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/overview/window_selector_controller.cc
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/overview/window_selector_controller.h
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/workspace/backdrop_controller.cc
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/workspace/backdrop_controller.h
[modify] https://crrev.com/5dc1b34404597c461844ae64dbcf11ce6a14b8e1/ash/wm/workspace/workspace_layout_manager.cc

Status: Started (was: Untriaged)
Project Member

Comment 9 by bugdroid1@chromium.org, Nov 2

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2

commit 46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Fri Nov 02 04:58:15 2018

Overview optimizations

This is 2nd attempt to land: crrev.com/c/1304973
[2] are the difference from above CL.

*[2] Added null check in OnStartingAnimationComplete.
* Pause occusion tracker during overview animation
 [2] wait 5000ms when exiting overview before resume
       because a user may re-enter overview
 [2] wait 50ms when entering overview before resume
       because it can take 2 frame to finish draing the frame
       after animation observer is called.
* Activate the text filter after animation
* [2]Animate shelf after overview animation.
* [2] Improve blur animation:
 Use Compositor's AnimationObesrver to drive animation
 Progress only by 2 to reduce the frequency.
* Don't animate backdrop window during overview animation.
* Fix the bounds change issue in WindowGrid. It shouldn't change
the parent window's bounds.


Bug:  898077 ,  897387 , b/118675936
Test: no functional change. Manually tested visual change by entering/exiting overview mode
  in both clamshell and tabletmode.
  The web contents should load after animations without backdrop animation.
  No gap at the bottom of the screen after exiting overview mode.

Change-Id: I5e5dc17afd62d4dc477d87becdeee91c55bd81ca
Reviewed-on: https://chromium-review.googlesource.com/c/1304973
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#604206}
Reviewed-on: https://chromium-review.googlesource.com/c/1312614
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604844}
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/shelf/shelf_layout_manager.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/shelf/shelf_layout_manager.h
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/window_selector.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/window_selector.h
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/window_selector_controller.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/window_selector_controller.h
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/workspace/backdrop_controller.cc
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/workspace/backdrop_controller.h
[modify] https://crrev.com/46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2/ash/wm/workspace/workspace_layout_manager.cc

Project Member

Comment 10 by bugdroid1@chromium.org, Nov 2

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3f852913c7c42a63171ed611ff8ddc47faaccbe7

commit 3f852913c7c42a63171ed611ff8ddc47faaccbe7
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Fri Nov 02 21:20:49 2018

Revert "Overview optimizations"

This reverts commit 46a9bbb1c1e2371ef52c81ecca7085c7fd00b5c2.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Overview optimizations
> 
> This is 2nd attempt to land: crrev.com/c/1304973
> [2] are the difference from above CL.
> 
> *[2] Added null check in OnStartingAnimationComplete.
> * Pause occusion tracker during overview animation
>  [2] wait 5000ms when exiting overview before resume
>        because a user may re-enter overview
>  [2] wait 50ms when entering overview before resume
>        because it can take 2 frame to finish draing the frame
>        after animation observer is called.
> * Activate the text filter after animation
> * [2]Animate shelf after overview animation.
> * [2] Improve blur animation:
>  Use Compositor's AnimationObesrver to drive animation
>  Progress only by 2 to reduce the frequency.
> * Don't animate backdrop window during overview animation.
> * Fix the bounds change issue in WindowGrid. It shouldn't change
> the parent window's bounds.
> 
> 
> Bug:  898077 ,  897387 , b/118675936
> Test: no functional change. Manually tested visual change by entering/exiting overview mode
>   in both clamshell and tabletmode.
>   The web contents should load after animations without backdrop animation.
>   No gap at the bottom of the screen after exiting overview mode.
> 
> Change-Id: I5e5dc17afd62d4dc477d87becdeee91c55bd81ca
> Reviewed-on: https://chromium-review.googlesource.com/c/1304973
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> Cr-Original-Commit-Position: refs/heads/master@{#604206}
> Reviewed-on: https://chromium-review.googlesource.com/c/1312614
> Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#604844}

TBR=oshima@chromium.org,sammiequon@chromium.org,malaykeshav@chromium.org

Change-Id: Ia07f696386ce2889a1d6344218be355a3515975c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  898077 ,  897387 , b/118675936
Reviewed-on: https://chromium-review.googlesource.com/c/1316169
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605052}
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/shelf/shelf_layout_manager.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/shelf/shelf_layout_manager.h
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/window_selector.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/window_selector.h
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/window_selector_controller.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/window_selector_controller.h
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/workspace/backdrop_controller.cc
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/workspace/backdrop_controller.h
[modify] https://crrev.com/3f852913c7c42a63171ed611ff8ddc47faaccbe7/ash/wm/workspace/workspace_layout_manager.cc

Blockedon: 901555
Project Member

Comment 12 by bugdroid1@chromium.org, Nov 3

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6b7d5bc765358e9ed475fb7b451db040beb37e3c

commit 6b7d5bc765358e9ed475fb7b451db040beb37e3c
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Sat Nov 03 01:00:59 2018

Overview optimizations

This is 2nd attempt to land: crrev.com/c/1304973
[2] are the difference from above CL.

*[2] Added null check in OnStartingAnimationComplete.
* Pause occusion tracker during overview animation
 [2] wait 5000ms when exiting overview before resume
       because a user may re-enter overview
 [2] wait 50ms when entering overview before resume
       because it can take 2 frame to finish draing the frame
       after animation observer is called.
* Activate the text filter after animation
* [2]Animate shelf after overview animation.
* [2] Improve blur animation:
 Use Compositor's AnimationObesrver to drive animation
 Progress only by 2 to reduce the frequency.
* Don't animate backdrop window during overview animation.
* Fix the bounds change issue in WindowGrid. It shouldn't change
the parent window's bounds.

  in both clamshell and tabletmode.
  The web contents should load after animations without backdrop animation.
  No gap at the bottom of the screen after exiting overview mode.

Bug:  898077 ,  897387 
Test: no functional change. Manually tested visual change by entering/exiting overview mode
Change-Id: I0e606af2ad2f8871108e17e6147e51d0b68b5ee6
Reviewed-on: https://chromium-review.googlesource.com/c/1316828
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605114}
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/shelf/shelf_layout_manager.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/shelf/shelf_layout_manager.h
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/window_selector.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/window_selector.h
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/window_selector_controller.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/window_selector_controller.h
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/workspace/backdrop_controller.cc
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/workspace/backdrop_controller.h
[modify] https://crrev.com/6b7d5bc765358e9ed475fb7b451db040beb37e3c/ash/wm/workspace/workspace_layout_manager.cc

Cc: yiyix@chromium.org
Labels: Merge-Request-71
Tested on today's canary 72.0.3601.0 / 11231.0.0. 
Project Member

Comment 15 by sheriffbot@chromium.org, Nov 5

Labels: -Merge-Request-71 Hotlist-Merge-Review Merge-Review-71
This bug requires manual review: Reverts referenced in bugdroid comments after merge request.
Please contact the milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
Labels: -Merge-Review-71 Merge-Approved-71
Merge approved for ChromeOS 71
Project Member

Comment 17 by bugdroid1@chromium.org, Nov 7

Labels: -merge-approved-71 merge-merged-3578
The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e06cf8ce35adde393617d658d1cd213cd5bc02b8

commit e06cf8ce35adde393617d658d1cd213cd5bc02b8
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Wed Nov 07 00:39:37 2018

Overview optimizations

This is 2nd attempt to land: crrev.com/c/1304973
[2] are the difference from above CL.

*[2] Added null check in OnStartingAnimationComplete.
* Pause occusion tracker during overview animation
 [2] wait 5000ms when exiting overview before resume
       because a user may re-enter overview
 [2] wait 50ms when entering overview before resume
       because it can take 2 frame to finish draing the frame
       after animation observer is called.
* Activate the text filter after animation
* [2]Animate shelf after overview animation.
* [2] Improve blur animation:
 Use Compositor's AnimationObesrver to drive animation
 Progress only by 2 to reduce the frequency.
* Don't animate backdrop window during overview animation.
* Fix the bounds change issue in WindowGrid. It shouldn't change
the parent window's bounds.

  in both clamshell and tabletmode.
  The web contents should load after animations without backdrop animation.
  No gap at the bottom of the screen after exiting overview mode.

Bug:  898077 ,  897387 
Test: no functional change. Manually tested visual change by entering/exiting overview mode
Change-Id: I0e606af2ad2f8871108e17e6147e51d0b68b5ee6
Reviewed-on: https://chromium-review.googlesource.com/c/1316828
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#605114}(cherry picked from commit 6b7d5bc765358e9ed475fb7b451db040beb37e3c)
Reviewed-on: https://chromium-review.googlesource.com/c/1321770
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#552}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/shelf/shelf_layout_manager.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/shelf/shelf_layout_manager.h
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/window_selector.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/window_selector.h
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/window_selector_controller.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/window_selector_controller.h
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/workspace/backdrop_controller.cc
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/workspace/backdrop_controller.h
[modify] https://crrev.com/e06cf8ce35adde393617d658d1cd213cd5bc02b8/ash/wm/workspace/workspace_layout_manager.cc

Labels: Merge-Merged-71-3578
The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/e06cf8ce35adde393617d658d1cd213cd5bc02b8

Commit: e06cf8ce35adde393617d658d1cd213cd5bc02b8
Author: oshima@chromium.org
Commiter: oshima@chromium.org
Date: 2018-11-07 00:39:37 +0000 UTC

Overview optimizations

This is 2nd attempt to land: crrev.com/c/1304973
[2] are the difference from above CL.

*[2] Added null check in OnStartingAnimationComplete.
* Pause occusion tracker during overview animation
 [2] wait 5000ms when exiting overview before resume
       because a user may re-enter overview
 [2] wait 50ms when entering overview before resume
       because it can take 2 frame to finish draing the frame
       after animation observer is called.
* Activate the text filter after animation
* [2]Animate shelf after overview animation.
* [2] Improve blur animation:
 Use Compositor's AnimationObesrver to drive animation
 Progress only by 2 to reduce the frequency.
* Don't animate backdrop window during overview animation.
* Fix the bounds change issue in WindowGrid. It shouldn't change
the parent window's bounds.

  in both clamshell and tabletmode.
  The web contents should load after animations without backdrop animation.
  No gap at the bottom of the screen after exiting overview mode.

Bug:  898077 ,  897387 
Test: no functional change. Manually tested visual change by entering/exiting overview mode
Change-Id: I0e606af2ad2f8871108e17e6147e51d0b68b5ee6
Reviewed-on: https://chromium-review.googlesource.com/c/1316828
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#605114}(cherry picked from commit 6b7d5bc765358e9ed475fb7b451db040beb37e3c)
Reviewed-on: https://chromium-review.googlesource.com/c/1321770
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#552}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
Status: Fixed (was: Started)
Blocking: 905388

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