The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7138892f3594182055e60b713494123f75f49b25

commit 7138892f3594182055e60b713494123f75f49b25
Author: edchin <edchin@chromium.org>
Date: Fri Feb 16 23:08:21 2018

[ios] Tab grid toolbars initial implementations

Bug:  804499 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I066fc6b53f8f2775f559f8dd75ab63d629b74e9d
Reviewed-on: https://chromium-review.googlesource.com/924381
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537447}
[modify] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/chrome/browser/ui/tab_grid/BUILD.gn
[add] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/chrome/browser/ui/tab_grid/tab_grid_bottom_toolbar.h
[add] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/chrome/browser/ui/tab_grid/tab_grid_bottom_toolbar.mm
[add] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/chrome/browser/ui/tab_grid/tab_grid_top_toolbar.h
[add] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/chrome/browser/ui/tab_grid/tab_grid_top_toolbar.mm
[modify] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm
[modify] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/showcase/core/showcase_model.mm
[modify] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/showcase/tab_grid/BUILD.gn
[add] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/showcase/tab_grid/sc_tab_grid_coordinator.h
[add] https://crrev.com/7138892f3594182055e60b713494123f75f49b25/ios/showcase/tab_grid/sc_tab_grid_coordinator.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1f50f93d24ad8f9e2413f851f28d05c1762c73e0

commit 1f50f93d24ad8f9e2413f851f28d05c1762c73e0
Author: edchin <edchin@chromium.org>
Date: Thu Feb 22 04:04:47 2018

[ios] Add showcase for tab grid toolbars

Snapshot:
https://drive.google.com/file/d/1njQHtrmrMj6qDI6s4r7-0e2pzP3zb4QG

Bug:  804499 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I21147d3460424f8124b96a3292ed604cbebf1407
Reviewed-on: https://chromium-review.googlesource.com/927941
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538343}
[modify] https://crrev.com/1f50f93d24ad8f9e2413f851f28d05c1762c73e0/ios/chrome/browser/ui/tab_grid/tab_grid_bottom_toolbar.h
[modify] https://crrev.com/1f50f93d24ad8f9e2413f851f28d05c1762c73e0/ios/chrome/browser/ui/tab_grid/tab_grid_bottom_toolbar.mm
[modify] https://crrev.com/1f50f93d24ad8f9e2413f851f28d05c1762c73e0/ios/showcase/core/showcase_model.mm
[modify] https://crrev.com/1f50f93d24ad8f9e2413f851f28d05c1762c73e0/ios/showcase/tab_grid/BUILD.gn
[add] https://crrev.com/1f50f93d24ad8f9e2413f851f28d05c1762c73e0/ios/showcase/tab_grid/sc_toolbars_view_controller.h
[add] https://crrev.com/1f50f93d24ad8f9e2413f851f28d05c1762c73e0/ios/showcase/tab_grid/sc_toolbars_view_controller.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29

commit 6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29
Author: edchin <edchin@chromium.org>
Date: Wed Feb 28 01:13:53 2018

[ios] TabGridViewController improvements

This CL refines the TabGridViewController to include the scroll view,
incognito tabs, regular tabs, placeholder for remote tabs, top toolbar,
bottom toolbar, the floating action button. Protocols are used to
expose delegates, image data sources, and consumers to the outside
world.

Bug:  804496 ,  804499 ,  804497 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I3bc3e6b391f50a183b6b4e8103a32dbc0ee34ec1
Reviewed-on: https://chromium-review.googlesource.com/936041
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539610}
[modify] https://crrev.com/6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29/ios/chrome/browser/ui/tab_grid/BUILD.gn
[modify] https://crrev.com/6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29/ios/chrome/browser/ui/tab_grid/grid_layout.mm
[modify] https://crrev.com/6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.h
[modify] https://crrev.com/6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm
[modify] https://crrev.com/6f60fb4fa01f7df5713ad4d0bbdd77801a3d3c29/ios/showcase/tab_grid/sc_tab_grid_coordinator.mm

The NextAction date has arrived: 2018-02-28

The toolbars are roughly done (minus the segmented control). 

The remaining polish work can only be done after UX delivers a spec. 
I consolidated all spec-driven work to another task that is blocked on UX.
See this task:
https://bugs.chromium.org/p/chromium/issues/detail?id=818198

Realized that this should have included setting the right toolbars for the current size class. This CL is in-flight and bumps this task to medium.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/21a15b2820ae0fe8cb98ea1f33fb0a3054830145

commit 21a15b2820ae0fe8cb98ea1f33fb0a3054830145
Author: edchin <edchin@chromium.org>
Date: Tue Mar 13 16:17:45 2018

[ios] Setup tab grid toolbars for current size class

This CL configures the tab grid toolbars for the current
size class. For example, a portrait phone will have a
bottom toolbar whereas an iPad will have a FAB.
This CL configures based on size classes, not device
idioms.

Bug:  804499 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I56cb26e43f92ee6152bd5b1e1d747bafbc052880
Reviewed-on: https://chromium-review.googlesource.com/959921
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542820}
[modify] https://crrev.com/21a15b2820ae0fe8cb98ea1f33fb0a3054830145/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

The NextAction date has arrived: 2018-03-14