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Issue metadata

Status: Fixed
Owner:
Closed: Sep 14
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Android , Windows , Chrome , Mac
Pri: 2
Type: Feature


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Implement testing infrastructure for BlinkGenPropertyTrees

Project Member Reported by pdr@chromium.org, Apr 25 2018

Issue description

This is a tracking bug for the infrastructure work needed to support unified property tree generation.

Some known tasks include:
  Repurpose SPV2 trybot for BlinkGenPropertyTrees
  Add asserts to cc that old property trees == new property trees
 

Comment 1 by pdr@chromium.org, Apr 30 2018

Blockedon: 838354
Project Member

Comment 2 by bugdroid1@chromium.org, Apr 30 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3eb645cceaf1388986e7a0cc1723522926c2a7c6

commit 3eb645cceaf1388986e7a0cc1723522926c2a7c6
Author: Philip Rogers <pdr@chromium.org>
Date: Mon Apr 30 22:25:19 2018

[BlinkGenPropertyTrees] Add skeleton for layout test infrastructure

Adds a skeleton of basic layout test infrastructure. A virtual test
suite has been added just to have some basic coverage on the commit
queue. Flag expectations should be used for all other tests. An
initial set of failing tests have been added.

The primary way to run tests should be:
run-webkit-tests --additional-driver-flag=--enable-blink-gen-property-trees

Bug:  836902 
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ie440e26e545bdaa30a1a87ef407dbea1eca59920
Reviewed-on: https://chromium-review.googlesource.com/1035534
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554900}
[add] https://crrev.com/3eb645cceaf1388986e7a0cc1723522926c2a7c6/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-gen-property-trees
[modify] https://crrev.com/3eb645cceaf1388986e7a0cc1723522926c2a7c6/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
[modify] https://crrev.com/3eb645cceaf1388986e7a0cc1723522926c2a7c6/third_party/WebKit/LayoutTests/VirtualTestSuites
[add] https://crrev.com/3eb645cceaf1388986e7a0cc1723522926c2a7c6/third_party/WebKit/LayoutTests/virtual/blink-gen-property-trees/paint/transparency/README.txt
[modify] https://crrev.com/3eb645cceaf1388986e7a0cc1723522926c2a7c6/third_party/blink/renderer/core/paint/paint_property_tree_builder.cc

Project Member

Comment 3 by bugdroid1@chromium.org, May 1 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dcf07e326c023622947b3e6ec6ccc1bb7d256cbd

commit dcf07e326c023622947b3e6ec6ccc1bb7d256cbd
Author: Philip Rogers <pdr@chromium.org>
Date: Tue May 01 17:02:33 2018

[BlinkGenPropertyTrees] Run paint unit tests with BlinkGenPropertyTrees

This patch starts running the paint unit tests with the new
BlinkGenPropertyTrees configuration.

A small codechange was required to pass FrameThrottlingTest's
LifecycleUpdateAfterUnthrottledCompositingUpdate test. Just like
https://chromium-review.googlesource.com/c/chromium/src/+/900262,
we need to skip the collection of throttled GraphicsLayers because
the property tree state will be undefined.

Bug:  836902 
Change-Id: I038d55bb05e9560f7e1bd0594cb3386a8bae016a
Reviewed-on: https://chromium-review.googlesource.com/1037189
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555080}
[modify] https://crrev.com/dcf07e326c023622947b3e6ec6ccc1bb7d256cbd/third_party/blink/renderer/core/frame/local_frame_view.cc
[modify] https://crrev.com/dcf07e326c023622947b3e6ec6ccc1bb7d256cbd/third_party/blink/renderer/platform/testing/paint_test_configurations.h

Project Member

Comment 4 by bugdroid1@chromium.org, Jun 18 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4531d1ad41a9db48f59774118995c06875ee1b24

commit 4531d1ad41a9db48f59774118995c06875ee1b24
Author: Philip Rogers <pdr@chromium.org>
Date: Mon Jun 18 15:13:46 2018

[BlinkGenPropertyTrees] DCHECK that use_layer_lists is enabled

In [1] we found tests were being run with BlinkGenPropertyTrees enabled
but without use_layer_lists. This issue is difficult to debug and will
hit other developers. This patch adds a DCHECK that use_layer_lists is
enabled.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1083012

Bug:  836902 
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0c9cc1393100a66528abae84842e2164fb4ad107
Reviewed-on: https://chromium-review.googlesource.com/1102562
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568012}
[modify] https://crrev.com/4531d1ad41a9db48f59774118995c06875ee1b24/third_party/blink/renderer/platform/graphics/compositing/paint_artifact_compositor.cc

Comment 5 by bokan@chromium.org, Jun 19 2018

Blockedon: 854200
Project Member

Comment 6 by bugdroid1@chromium.org, Aug 21

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6bdec7f4bc5d4e9ffe920ef1181ab2663621ebbc

commit 6bdec7f4bc5d4e9ffe920ef1181ab2663621ebbc
Author: Philip Rogers <pdr@chromium.org>
Date: Tue Aug 21 16:29:06 2018

[BlinkGenPropertyTrees] Add blink->cc scroll layer tests

This patch updates the paint-related WebFrameTests to run with
BlinkGenPropertyTrees so the blink->cc layer integration is tested.
This test infrastructure will be useful in future patches to ensure
viewport layers/nodes are created. These paint WebFrameTests are
integration tests: they use html input and ensure the correct
cc::Layers are created.

Bug:  836902 
Change-Id: Iac6c6ce82b2ae45370d539a5f3c7722447296751
Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1180619
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584775}
[modify] https://crrev.com/6bdec7f4bc5d4e9ffe920ef1181ab2663621ebbc/third_party/blink/renderer/core/exported/web_frame_test.cc
[modify] https://crrev.com/6bdec7f4bc5d4e9ffe920ef1181ab2663621ebbc/third_party/blink/renderer/platform/testing/paint_test_configurations.h

Project Member

Comment 7 by bugdroid1@chromium.org, Sep 4

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eac266aa1bd6dcb746751d9f9013586ea754c8ca

commit eac266aa1bd6dcb746751d9f9013586ea754c8ca
Author: Philip Rogers <pdr@chromium.org>
Date: Tue Sep 04 16:01:58 2018

[BlinkGenPropertyTrees] Run PaintArtifactCompositor tests

PaintArtifactCompositor's tests were not running with
BlinkGenPropertyTrees (BGPT). This patch updates the tests to run in
both SlimmingPaintV2 (SPV2) and BGPT modes.

Some non-trivial changes were required because of the differences in
scrollable layers. In SPV2, special scroll hit test layers are created
in the unscrolled transform space. In BGPT, ScrollingCoordinator creates
scrollable layers associated with the scrolled transform space which are
passed to PaintArtifactcompositor as foreign layers.

Bug:  836902 
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1c50c90eba8918dd607472b93a835336a1f1af0c
Reviewed-on: https://chromium-review.googlesource.com/1201442
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588526}
[modify] https://crrev.com/eac266aa1bd6dcb746751d9f9013586ea754c8ca/third_party/blink/renderer/platform/graphics/compositing/paint_artifact_compositor_test.cc

Project Member

Comment 8 by bugdroid1@chromium.org, Sep 4

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eac266aa1bd6dcb746751d9f9013586ea754c8ca

commit eac266aa1bd6dcb746751d9f9013586ea754c8ca
Author: Philip Rogers <pdr@chromium.org>
Date: Tue Sep 04 16:01:58 2018

[BlinkGenPropertyTrees] Run PaintArtifactCompositor tests

PaintArtifactCompositor's tests were not running with
BlinkGenPropertyTrees (BGPT). This patch updates the tests to run in
both SlimmingPaintV2 (SPV2) and BGPT modes.

Some non-trivial changes were required because of the differences in
scrollable layers. In SPV2, special scroll hit test layers are created
in the unscrolled transform space. In BGPT, ScrollingCoordinator creates
scrollable layers associated with the scrolled transform space which are
passed to PaintArtifactcompositor as foreign layers.

Bug:  836902 
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1c50c90eba8918dd607472b93a835336a1f1af0c
Reviewed-on: https://chromium-review.googlesource.com/1201442
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588526}
[modify] https://crrev.com/eac266aa1bd6dcb746751d9f9013586ea754c8ca/third_party/blink/renderer/platform/graphics/compositing/paint_artifact_compositor_test.cc

Project Member

Comment 9 by bugdroid1@chromium.org, Sep 4

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eac266aa1bd6dcb746751d9f9013586ea754c8ca

commit eac266aa1bd6dcb746751d9f9013586ea754c8ca
Author: Philip Rogers <pdr@chromium.org>
Date: Tue Sep 04 16:01:58 2018

[BlinkGenPropertyTrees] Run PaintArtifactCompositor tests

PaintArtifactCompositor's tests were not running with
BlinkGenPropertyTrees (BGPT). This patch updates the tests to run in
both SlimmingPaintV2 (SPV2) and BGPT modes.

Some non-trivial changes were required because of the differences in
scrollable layers. In SPV2, special scroll hit test layers are created
in the unscrolled transform space. In BGPT, ScrollingCoordinator creates
scrollable layers associated with the scrolled transform space which are
passed to PaintArtifactcompositor as foreign layers.

Bug:  836902 
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1c50c90eba8918dd607472b93a835336a1f1af0c
Reviewed-on: https://chromium-review.googlesource.com/1201442
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588526}
[modify] https://crrev.com/eac266aa1bd6dcb746751d9f9013586ea754c8ca/third_party/blink/renderer/platform/graphics/compositing/paint_artifact_compositor_test.cc

Status: Fixed (was: Assigned)
Project Member

Comment 11 by bugdroid1@chromium.org, Oct 21

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a7d66f97e3e24117a3017e49f4a076adec860ea1

commit a7d66f97e3e24117a3017e49f4a076adec860ea1
Author: Philip Rogers <pdr@chromium.org>
Date: Sun Oct 21 04:12:28 2018

[BlinkGenPropertyTrees] Pass all unit tests with BGPT

This patch prepares for promoting BlinkGenPropertyTrees (BGPT) to
experimental by ensuring all unit tests pass. This patch has three
changes:
1) The foreign layer BGPT code has been disabled when SPV2 is on in
LocalFrameView::PaintTree.
2) Some CompositedLayerMapping tests of non-BGPT code have been changed
to only run without BGPT.
3) ScrollingCoordinatorTest of sticky have been updated to look up
sticky constraints on property trees when BGPT is enabled.

Bug:  836902 
Change-Id: If5c32b3e02c0908bf505bddbb2d4b635b8049555
Reviewed-on: https://chromium-review.googlesource.com/c/1287169
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601428}
[modify] https://crrev.com/a7d66f97e3e24117a3017e49f4a076adec860ea1/third_party/blink/renderer/core/frame/local_frame_view.cc
[modify] https://crrev.com/a7d66f97e3e24117a3017e49f4a076adec860ea1/third_party/blink/renderer/core/page/scrolling/scrolling_coordinator_test.cc
[modify] https://crrev.com/a7d66f97e3e24117a3017e49f4a076adec860ea1/third_party/blink/renderer/core/paint/compositing/composited_layer_mapping_test.cc

Blockedon: 897772
Project Member

Comment 13 by bugdroid1@chromium.org, Oct 23

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/40bd3b7b37fbe7294560d7f2974539bbd72f6f0e

commit 40bd3b7b37fbe7294560d7f2974539bbd72f6f0e
Author: Philip Rogers <pdr@chromium.org>
Date: Tue Oct 23 22:13:36 2018

[BlinkGenPropertyTrees] Do not clear paint controller in SPV2 mode

This patch is a followup to https://crrev.com/601428 and stops clearing
the paint controller in SPV2 mode. This prevents flashing on all pages
when running with SPV2+BGPT and will unblock making BGPT experimental
(all SPV2 layout tests fail without this change):
  https://chromium-review.googlesource.com/c/chromium/src/+/1294204

Bug:  836902 
Change-Id: I80bea03bc3d06c5fe6761734babdf6517813e7bb
Reviewed-on: https://chromium-review.googlesource.com/c/1297060
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602128}
[modify] https://crrev.com/40bd3b7b37fbe7294560d7f2974539bbd72f6f0e/third_party/blink/renderer/core/frame/local_frame_view.cc

Project Member

Comment 14 by bugdroid1@chromium.org, Oct 23

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/40bd3b7b37fbe7294560d7f2974539bbd72f6f0e

commit 40bd3b7b37fbe7294560d7f2974539bbd72f6f0e
Author: Philip Rogers <pdr@chromium.org>
Date: Tue Oct 23 22:13:36 2018

[BlinkGenPropertyTrees] Do not clear paint controller in SPV2 mode

This patch is a followup to https://crrev.com/601428 and stops clearing
the paint controller in SPV2 mode. This prevents flashing on all pages
when running with SPV2+BGPT and will unblock making BGPT experimental
(all SPV2 layout tests fail without this change):
  https://chromium-review.googlesource.com/c/chromium/src/+/1294204

Bug:  836902 
Change-Id: I80bea03bc3d06c5fe6761734babdf6517813e7bb
Reviewed-on: https://chromium-review.googlesource.com/c/1297060
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602128}
[modify] https://crrev.com/40bd3b7b37fbe7294560d7f2974539bbd72f6f0e/third_party/blink/renderer/core/frame/local_frame_view.cc

Blockedon: 914990
Project Member

Comment 16 by bugdroid1@chromium.org, Dec 20

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/40ac3e0dfaf5a4b1f73441222f91f7f19f148396

commit 40ac3e0dfaf5a4b1f73441222f91f7f19f148396
Author: Philip Rogers <pdr@chromium.org>
Date: Thu Dec 20 17:13:18 2018

Cleanup cc::Layer and cc::LayerImpl logging

This patch makes the following changes to cc::Layer{Impl} logging:
1) LayerTreeHostImpl::LayerListAsJson has been moved to
LayerTreeImpl::LayerListAsJson. This lets us fix a bug where logging the
layer list in LayerTreeHost::FinishCommitOnImplThread would log the
active tree instead of the sync tree.
2) JSON output now prints with OPTIONS_OMIT_DOUBLE_TYPE_PRESERVATION.
This simplifies long output from:
  "local": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ],
to:
  "local": [ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 ],
3) The cc::Layer logging now lists property tree indices on one line.
4) When logging layers, we now specify cc::Layer or cc::LayerImpl.
5) cc::LayerImpl's "OPACITY" value has been softened to "Opacity".

To test this change, run content shell with: --vmodule=*layer_tree_host*=3

This patch is in support of improved documentation for debugging blink & cc:
https://docs.google.com/document/d/1vgQY11pxRQUDAufxSsc2xKyQCKGPftZ5wZnjY2El4w8

Bug:  836902 

Change-Id: I259b64b194ac569dc97eace2c2470ff80c7d2fa5
Reviewed-on: https://chromium-review.googlesource.com/c/1386650
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618252}
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/layers/layer_impl.cc
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/test/layer_tree_json_parser_unittest.cc
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/trees/layer_tree_host.cc
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/trees/layer_tree_host_impl.cc
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/trees/layer_tree_host_impl.h
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/trees/layer_tree_impl.cc
[modify] https://crrev.com/40ac3e0dfaf5a4b1f73441222f91f7f19f148396/cc/trees/layer_tree_impl.h

Project Member

Comment 17 by bugdroid1@chromium.org, Jan 4

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/92f7238f18f6b11500e89eda44a47874f950dfc4

commit 92f7238f18f6b11500e89eda44a47874f950dfc4
Author: Philip Rogers <pdr@chromium.org>
Date: Fri Jan 04 19:01:59 2019

Add ToString functions to cc::Layer, cc::LayerImpl, and cc::PropertyTrees

These functions will aid in debugging, particularly from a debugger.

This patch is in support of improved documentation for debugging blink & cc:
https://docs.google.com/document/d/1vgQY11pxRQUDAufxSsc2xKyQCKGPftZ5wZnjY2El4w8

Bug:  836902 
Change-Id: Ibe1da5b3335a130362b8baa12f005dc7cb23ff04
Reviewed-on: https://chromium-review.googlesource.com/c/1396220
Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620021}
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/layer.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/layer.h
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/layer_impl.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/layer_impl.h
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/nine_patch_layer_impl.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/nine_patch_layer_impl.h
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/ui_resource_layer_impl.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/layers/ui_resource_layer_impl.h
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/trees/layer_tree_host.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/trees/layer_tree_host_impl.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/trees/property_tree.cc
[modify] https://crrev.com/92f7238f18f6b11500e89eda44a47874f950dfc4/cc/trees/property_tree.h

Project Member

Comment 18 by bugdroid1@chromium.org, Jan 10

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9924d633da19c65386bbac86f901e98965300b2c

commit 9924d633da19c65386bbac86f901e98965300b2c
Author: Philip Rogers <pdr@chromium.org>
Date: Thu Jan 10 01:39:17 2019

Add offset, element id, and property tree indices to LayerImpl json

This patch adds the following fields to the LayerImpl json output:
  OffsetToTransformParent
  ElementId
  transform_tree_index
  clip_tree_index
  effect_tree_index
  scroll_tree_index

Using lowercase names for the property tree indices keeps them grouped
together if the json is sorted. The formatting of cc::Layer's output
has been updated to more closely match this output.

With this change, a cc::LayerImpl::ToString looks like:
  "Bounds": [ 100, 100 ],
  "ContentsOpaque": true,
  "DrawsContent": true,
  "ElementId": "(128)",
  "HitTestableWithoutDrawsContent": true,
  "Is3dSorted": false,
  "LayerId": 10,
  "LayerType": "cc::PictureLayerImpl",
  "OffsetToTransformParent": [ 0, 0 ],
  "Opacity": 1,
  "Transform": [ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 ],
  "clip_tree_index": 2,
  "effect_tree_index": 2,
  "scroll_tree_index": 3,
  "transform_tree_index": 6


The corresponding cc::Layer::ToString looks like:
  layer_id: 10
    Bounds: 100x100
    ElementId: (128)
    OffsetToTransformParent: [0.000000 0.000000]
    Position: 13.000000,0.000000
    scrollable: 0
    clip_tree_index: 2
    effect_tree_index: 2
    scroll_tree_index: 3
    transform_tree_index: 6

Bug:  836902 
Change-Id: I2b7929c1574504b6edf830f376b548074f4a19b7
Reviewed-on: https://chromium-review.googlesource.com/c/1403495
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621412}
[modify] https://crrev.com/9924d633da19c65386bbac86f901e98965300b2c/cc/layers/layer.cc
[modify] https://crrev.com/9924d633da19c65386bbac86f901e98965300b2c/cc/layers/layer_impl.cc

Blockedon: 920668

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