Paint solid color backgrounds which are equivalent to locally attached into scrolling contents layer

Paint solid color backgrounds which are equivalent to locally attached into scrolling contents layer

If we have a solid color background whose bounds / visible rect is equivalent to the padding-box we can treat it as locally attached and paint it into the scrolling contents layer. This enables composited scrolling with sub-pixel text anti-aliasing.

BUG=381840
TEST=CompositedLayerMappingTest.ShouldPaintBackgroundOntoScrollingContentsLayer
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Committed: https://crrev.com/3a79cf9764213b54bf9e5a0be2198f029a3540c8
Cr-Commit-Position: refs/heads/master@{#415973}

[flackr, 2016-08-22 15:35:01]

Description was changed from

==========
Detect solid color backgrounds which are equivalent to locally attached.

BUG=381840
TEST=None yet
==========

to

==========
Detect solid color backgrounds which are equivalent to locally attached.

BUG=381840
TEST=None yet
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[flackr, 2016-08-22 15:35:42]

Description was changed from

==========
Detect solid color backgrounds which are equivalent to locally attached.

BUG=381840
TEST=None yet
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

to

==========
Detect solid color backgrounds which are equivalent to locally attached.

BUG=381840
TEST=CompositedLayerMappingTest.ShouldPaintBackgroundOntoScrollingContentsLayer
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[flackr, 2016-08-22 15:37:50]

Description was changed from

==========
Detect solid color backgrounds which are equivalent to locally attached.

BUG=381840
TEST=CompositedLayerMappingTest.ShouldPaintBackgroundOntoScrollingContentsLayer
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

to

==========
Paint solid color backgrounds which are equivalent to locally attached into
scrolling contents layer

If we have a solid color background whose bounds / visible rect is equivalent to
the padding-box we can treat it as locally attached and paint it into the
scrolling contents layer. This enables composited scrolling with sub-pixel text
anti-aliasing.

BUG=381840
TEST=CompositedLayerMappingTest.ShouldPaintBackgroundOntoScrollingContentsLayer
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[flackr, 2016-08-22 15:39:31]

flackr@chromium.org changed reviewers:
+ chrishtr@chromium.org

[flackr, 2016-08-22 15:39:31]

PTAL, this should handle allowing compositing the common cases on the web where
the background of a scroller has not been made explicitly local but it is
equivalent to a locally attached background.

[chrishtr, 2016-08-22 22:10:51]

lgtm

https://codereview.chromium.org/2264663002/diff/20001/third_party/WebKit/Sour...
File
third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
(right):

https://codereview.chromium.org/2264663002/diff/20001/third_party/WebKit/Sour...
third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp:693:
// padding box since it has no padding
nit: add period.

[flackr, 2016-08-26 15:41:16]

https://codereview.chromium.org/2264663002/diff/20001/third_party/WebKit/Sour...
File
third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
(right):

https://codereview.chromium.org/2264663002/diff/20001/third_party/WebKit/Sour...
third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp:693:
// padding box since it has no padding
On 2016/08/22 at 22:10:51, chrishtr wrote:
> nit: add period.

Done.

[flackr, 2016-08-26 20:29:07]

The CQ bit was checked by flackr@chromium.org

[flackr, 2016-08-26 20:29:07]

The patchset sent to the CQ was uploaded after l-g-t-m from
chrishtr@chromium.org
Link to the patchset: https://codereview.chromium.org/2264663002/#ps40001
(title: "Add period.")

[commit-bot: I haz the power, 2016-08-26 20:30:07]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-26 22:36:46]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-26 22:36:47]

Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[flackr, 2016-08-27 13:57:57]

The tests turned up a case this wasn't handling correctly, a custom scrollbar
can mean that we have to paint the background under it in which case we can't
paint the background into the scrolling contents layer. I've moved
ComputedStyle::hasEntirelyLocalBackground to
LayoutBoxModelObject::hasLocalEquivalentBackground to be able to inspect whether
a custom scrollbar exists and added a test for this. PTAL, thanks.

[flackr, 2016-08-27 13:58:14]

The CQ bit was checked by flackr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-27 13:58:23]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-27 16:56:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-27 16:56:29]

Dry run: Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[flackr, 2016-08-29 03:15:37]

The CQ bit was checked by flackr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-29 03:15:47]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-29 04:45:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-29 04:45:26]

Dry run: Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[chrishtr, 2016-08-29 19:24:26]

The CQ bit was checked by chrishtr@chromium.org

[chrishtr, 2016-08-29 19:24:27]

lgtm

[commit-bot: I haz the power, 2016-08-29 19:43:11]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-30 03:24:59]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-30 03:25:00]

Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[flackr, 2016-08-31 19:52:56]

The CQ bit was checked by flackr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-31 19:53:36]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[flackr, 2016-08-31 19:55:01]

I found the cause of the failing tests on mac. Outlines can have a negative
offset. When they paint over the padding box into the graphics layer they can be
covered up by the scrolling contents layer. This is an existing bug but I've
updated my CL to not make this worse by not automatically painting backgrounds
into the scrolling contents layer if the outline should paint over it.

[commit-bot: I haz the power, 2016-08-31 21:30:37]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-31 21:30:38]

Dry run: This issue passed the CQ dry run.

[flackr, 2016-09-01 13:43:50]

Sorry about the churn on this patch, but it looks like everything passes now.

I filed https://crbug.com/642866 for the more general problem that when we
promote, the scrolling contents layer can cover up a negative offset outline,
but in this patch I prevent automatically painting the background into the
scrolling contents layer to prevent that from happening more often than it does
today.

Can you take a quick look at the changes? They are:
outlineOverlapsPaddingBox in LayoutBoxModelObject.cpp and tests for this
condition in
CompositedLayerMappingTest.cpp.

[chrishtr, 2016-09-01 16:40:23]

lgtm

[flackr, 2016-09-01 16:44:55]

The CQ bit was checked by flackr@chromium.org

[commit-bot: I haz the power, 2016-09-01 16:45:19]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-01 16:50:14]

Committed patchset #9 (id:160001)

[commit-bot: I haz the power, 2016-09-01 16:53:38]

Description was changed from

==========
Paint solid color backgrounds which are equivalent to locally attached into
scrolling contents layer

If we have a solid color background whose bounds / visible rect is equivalent to
the padding-box we can treat it as locally attached and paint it into the
scrolling contents layer. This enables composited scrolling with sub-pixel text
anti-aliasing.

BUG=381840
TEST=CompositedLayerMappingTest.ShouldPaintBackgroundOntoScrollingContentsLayer
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

to

==========
Paint solid color backgrounds which are equivalent to locally attached into
scrolling contents layer

If we have a solid color background whose bounds / visible rect is equivalent to
the padding-box we can treat it as locally attached and paint it into the
scrolling contents layer. This enables composited scrolling with sub-pixel text
anti-aliasing.

BUG=381840
TEST=CompositedLayerMappingTest.ShouldPaintBackgroundOntoScrollingContentsLayer
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Committed: https://crrev.com/3a79cf9764213b54bf9e5a0be2198f029a3540c8
Cr-Commit-Position: refs/heads/master@{#415973}
==========

[commit-bot: I haz the power, 2016-09-01 16:53:39]

Patchset 9 (id:??) landed as
https://crrev.com/3a79cf9764213b54bf9e5a0be2198f029a3540c8
Cr-Commit-Position: refs/heads/master@{#415973}

[magjed_chromium, 2016-09-02 09:42:44]

A revert of this CL (patchset #9 id:160001) has been created in
https://codereview.chromium.org/2308503002/ by magjed@chromium.org.

The reason for reverting is: This CL breaks
paint/selection/selection-within-composited-scroller.html on WebKit Win7 (dbg).
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20(dbg)

01:07:46.923 1952 worker/0
paint/selection/selection-within-composited-scroller.html crashed, (stderr
lines):
01:07:46.923 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=0 y=1170
47ffffff vs ffd3d3d3
01:07:46.923 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=1 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=2 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=3 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=4 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=5 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=6 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=7 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=8 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:drawingdisplayitem.cpp(100)] x=9 y=1170
47ffffff vs ffd3d3d3
01:07:46.924 1952  
[2516:5320:0902/010745:4409539:ERROR:paintcontroller.cpp(621)] ""
under-invalidation: display item changed
01:07:46.924 1952  
[2516:5320:0902/010745:4409555:ERROR:paintcontroller.cpp(623)] New display item:
"{client: \"35B71898 Scrolling Contents Layer\", type:
\"DrawingBoxDecorationBackground\", rect: [0.000000,0.000000
200.000000x1620.000000]}"
01:07:46.924 1952  
[2516:5320:0902/010745:4409555:ERROR:paintcontroller.cpp(624)] Old display item:
"{client: \"35B71898 Scrolling Contents Layer\", type:
\"DrawingBoxDecorationBackground\", rect: [0.000000,0.000000
200.000000x1620.000000]}"
01:07:46.924 1952  
[2516:5320:0902/010745:4409555:ERROR:paintcontroller.cpp(628)] See
http://crbug.com/619103.
01:07:46.924 1952  
[2516:5320:0902/010745:4409555:INFO:paintcontroller.cpp(633)] new picture:
01:07:46.924 1952   "{\n  \"cullRect\": {\n    \"left\": 0,\n    \"top\": 0,\n  
 \"right\": 200,\n    \"bottom\": 1620\n  },\n  \"operations\": [\n    {\n     
\"method\": \"drawRect\",\n      \"params\": {\n        \"rect\": {\n         
\"left\": 0,\n          \"top\": -450,\n          \"right\": 200,\n         
\"bottom\": 1170\n        },\n        \"paint\": {\n          \"textSize\":
12,\n          \"textScaleX\": 1,\n          \"textSkewX\": 0,\n         
\"color\": \"#FFD3D3D3\",\n          \"strokeWidth\": 0,\n         
\"strokeMiter\": 4,\n          \"flags\": \"AntiAlias\",\n         
\"filterLevel\": \"Low\",\n          \"textAlign\": \"Left\",\n         
\"strokeCap\": \"Butt\",\n          \"strokeJoin\": \"Miter\",\n         
\"styleName\": \"Fill\",\n          \"textEncoding\": \"UTF-8\",\n         
\"hinting\": \"Normal\"\n        }\n      }\n    }\n  ]\n}\n"
01:07:46.924 1952  
[2516:5320:0902/010745:4409555:INFO:paintcontroller.cpp(634)] old picture:
01:07:46.924 1952   "{\n  \"cullRect\": {\n    \"left\": 0,\n    \"top\": 0,\n  
 \"right\": 200,\n    \"bottom\": 1620\n  },\n  \"operations\": [\n    {\n     
\"method\": \"drawRect\",\n      \"params\": {\n        \"rect\": {\n         
\"left\": 0,\n          \"top\": 0,\n          \"right\": 200,\n         
\"bottom\": 1620\n        },\n        \"paint\": {\n          \"textSize\":
12,\n          \"textScaleX\": 1,\n          \"textSkewX\": 0,\n         
\"color\": \"#FFD3D3D3\",\n          \"strokeWidth\": 0,\n         
\"strokeMiter\": 4,\n          \"flags\": \"AntiAlias\",\n         
\"filterLevel\": \"Low\",\n          \"textAlign\": \"Left\",\n         
\"strokeCap\": \"Butt\",\n          \"strokeJoin\": \"Miter\",\n         
\"styleName\": \"Fill\",\n          \"textEncoding\": \"UTF-8\",\n         
\"hinting\": \"Normal\"\n        }\n      }\n    }\n  ]\n}\n"
01:07:46.924 1952   current display item list: [{index: 0, client: "35B71898
Scrolling Contents Layer", type: "DrawingBoxDecorationBackground", rect:
[0.000000,0.000000 200.000000x1620.000000], cacheIsValid: true, visualRect: [0,0
200x1620]},
01:07:46.924 1952   {index: 1, client: "40A1C570 LayoutBlockFlow DIV
id='scroller'", type: "ScrollPaintPhaseChildBlockBackgrounds", currentOffset:
[0,0], cacheIsValid: false, visualRect: [0,0 200x200]},
01:07:46.924 1952   {index: 2, client: "40A1C260 LayoutBlockFlow DIV", type:
"DrawingBoxDecorationBackground", rect: [0.000000,0.000000
100.000000x600.000000], cacheIsValid: true, visualRect: [0,0 100x600]},
01:07:46.924 1952   {index: 3, client: "40A1C634 LayoutBlockFlow DIV
id='target'", type: "DrawingBoxDecorationBackground", rect: [0.000000,610.000000
200.000000x1000.000000], cacheIsValid: false, visualRect: [0,610 200x1000]},
01:07:46.924 1952   {index: 4, client: "40A1C570 LayoutBlockFlow DIV
id='scroller'", type: "EndScrollPaintPhaseChildBlockBackgrounds", cacheIsValid:
false, visualRect: [0,0 200x200]},
01:07:46.924 1952   {index: 5, client: "40A1C570 LayoutBlockFlow DIV
id='scroller'", type: "ScrollPaintPhaseForeground", currentOffset: [0,0],
cacheIsValid: false, visualRect: [0,0 200x200]},
01:07:46.924 1952   {index: 6, client: "40A6C010 InlineTextBox 'test'", type:
"DrawingPaintPhaseForeground", rect: [0.000000,610.000000 23.000000x17.000000],
cacheIsValid: false, visualRect: [0,610 23x17]},
01:07:46.924 1952   {index: 7, client: "40A1C570 LayoutBlockFlow DIV
id='scroller'", type: "EndScrollPaintPhaseForeground", cacheIsValid: false,
visualRect: [0,0 200x200]}]
01:07:46.924 1952   new display item list: [{index: 0, client: "35B71898
Scrolling Contents Layer", type: "BeginTransform", transform:
[1.000000,0.000000,0.000000,1.000000,0.000000,450.000000], cacheIsValid: true},
01:07:46.924 1952   {index: 1, client: "35B71898 Scrolling Contents Layer",
type: "DrawingBoxDecorationBackground", rect: [0.000000,0.000000
200.000000x1620.000000], cacheIsValid: true}]
01:07:46.924 1952  
[2516:5320:0902/010745:4409555:FATAL:paintcontroller.cpp(674)] Check failed:
false. 
01:07:46.924 1952   Backtrace:
01:07:46.924 1952   	base::debug::StackTrace::StackTrace [0x01F0ADC7+23]
01:07:46.924 1952   	logging::LogMessage::~LogMessage [0x01F5844B+59]
01:07:46.925 1952   	blink::PaintController::checkUnderInvalidation
[0x0AE6ACB7+839]
01:07:46.925 1952   	blink::PaintController::processNewItem [0x0AE6F1D6+1558]
01:07:46.925 1952  
	blink::PaintController::createAndAppend<blink::DrawingDisplayItem,blink::DisplayItemClient
const &,enum blink::DisplayItem::Type const &,WTF::PassRefPtr<SkPicture>,bool &>
[0x0AE566C2+114]
01:07:46.925 1952   	blink::DrawingRecorder::~DrawingRecorder [0x0AE56B2E+302]
01:07:46.925 1952   	blink::BoxPainter::paintBoxDecorationBackgroundWithRect
[0x1578E899+1001]
01:07:46.925 1952   	blink::BoxPainter::paintBoxDecorationBackground
[0x1578E49E+334]
01:07:46.925 1952   	blink::LayoutBox::paintBoxDecorationBackground
[0x15927EC4+36]
01:07:46.925 1952   	blink::BlockPainter::paintObject [0x1577E854+116]
01:07:46.925 1952   	blink::LayoutBlock::paintObject [0x158F27D4+36]
01:07:46.925 1952   	blink::BlockPainter::paint [0x1577E329+233]
01:07:46.925 1952   	blink::LayoutBlock::paint [0x158F2774+36]
01:07:46.925 1952   	blink::PaintLayerPainter::paintFragmentWithPhase
[0x157D17A2+658]
01:07:46.925 1952   	blink::PaintLayerPainter::paintBackgroundForFragments
[0x157D09B2+130]
01:07:46.925 1952   	blink::PaintLayerPainter::paintLayerContents
[0x157D2550+2976]
01:07:46.925 1952   	blink::CompositedLayerMapping::doPaintTask [0x15A04F13+579]
01:07:46.925 1952   	blink::CompositedLayerMapping::paintContents
[0x15A06224+996]
01:07:46.925 1952   	blink::GraphicsLayer::paintWithoutCommit [0x0ACDD0F3+499]
01:07:46.925 1952   	blink::GraphicsLayer::paint [0x0ACDCC3C+44]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F746+38]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.925 1952   	blink::FrameView::synchronizedPaint [0x1552F689+601]
01:07:46.925 1952   	blink::FrameView::updateLifecyclePhasesInternal
[0x15530B8A+1306]
01:07:46.925 1952   	blink::FrameView::updateAllLifecyclePhases [0x155301D6+38]
01:07:46.925 1952   	blink::Internals::layerTreeAsText [0x00534AA2+146]
01:07:46.926 1952   	blink::Iterable<unsigned int,int>::keysForBinding
[0x00568FE6+1814]
01:07:46.926 1952   	blink::Iterable<unsigned int,int>::keysForBinding
[0x0056904C+1916]
01:07:46.926 1952   	v8::internal::FunctionCallbackArguments::Call
[0x093DFE93+179]
01:07:46.926 1952   	v8::internal::Isolate::typed_array_prototype
[0x09475B48+1800]
01:07:46.926 1952   	v8::internal::Builtin_HandleApiCallAsFunction
[0x09476828+552]
01:07:46.926 1952   	v8::internal::Builtin_HandleApiCall [0x09476505+165]
01:07:46.926 1952   
01:07:46.926 1952   Backtrace:
01:07:46.926 1952   	base::debug::BreakDebugger [0x01EF66E7+23]
01:07:46.926 1952   	logging::LogMessage::~LogMessage [0x01F586CD+701]
01:07:46.926 1952   	blink::PaintController::checkUnderInvalidation
[0x0AE6ACB7+839]
01:07:46.926 1952   	blink::PaintController::processNewItem [0x0AE6F1D6+1558]
01:07:46.926 1952  
	blink::PaintController::createAndAppend<blink::DrawingDisplayItem,blink::DisplayItemClient
const &,enum blink::DisplayItem::Type const &,WTF::PassRefPtr<SkPicture>,bool &>
[0x0AE566C2+114]
01:07:46.926 1952   	blink::DrawingRecorder::~DrawingRecorder [0x0AE56B2E+302]
01:07:46.926 1952   	blink::BoxPainter::paintBoxDecorationBackgroundWithRect
[0x1578E899+1001]
01:07:46.926 1952   	blink::BoxPainter::paintBoxDecorationBackground
[0x1578E49E+334]
01:07:46.926 1952   	blink::LayoutBox::paintBoxDecorationBackground
[0x15927EC4+36]
01:07:46.926 1952   	blink::BlockPainter::paintObject [0x1577E854+116]
01:07:46.926 1952   	blink::LayoutBlock::paintObject [0x158F27D4+36]
01:07:46.926 1952   	blink::BlockPainter::paint [0x1577E329+233]
01:07:46.926 1952   	blink::LayoutBlock::paint [0x158F2774+36]
01:07:46.926 1952   	blink::PaintLayerPainter::paintFragmentWithPhase
[0x157D17A2+658]
01:07:46.926 1952   	blink::PaintLayerPainter::paintBackgroundForFragments
[0x157D09B2+130]
01:07:46.926 1952   	blink::PaintLayerPainter::paintLayerContents
[0x157D2550+2976]
01:07:46.926 1952   	blink::CompositedLayerMapping::doPaintTask [0x15A04F13+579]
01:07:46.926 1952   	blink::CompositedLayerMapping::paintContents
[0x15A06224+996]
01:07:46.926 1952   	blink::GraphicsLayer::paintWithoutCommit [0x0ACDD0F3+499]
01:07:46.926 1952   	blink::GraphicsLayer::paint [0x0ACDCC3C+44]
01:07:46.926 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F746+38]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaintRecursively
[0x1552F7F6+214]
01:07:46.927 1952   	blink::FrameView::synchronizedPaint [0x1552F689+601]
01:07:46.927 1952   	blink::FrameView::updateLifecyclePhasesInternal
[0x15530B8A+1306]
01:07:46.927 1952   	blink::FrameView::updateAllLifecyclePhases [0x155301D6+38]
01:07:46.927 1952   	blink::Internals::layerTreeAsText [0x00534AA2+146]
01:07:46.927 1952   	blink::Iterable<unsigned int,int>::keysForBinding
[0x00568FE6+1814]
01:07:46.927 1952   	blink::Iterable<unsigned int,int>::keysForBinding
[0x0056904C+1916]
01:07:46.927 1952   	v8::internal::FunctionCallbackArguments::Call
[0x093DFE93+179]
01:07:46.927 1952   	v8::internal::Isolate::typed_array_prototype
[0x09475B48+1800]
01:07:46.927 1952   	v8::internal::Builtin_HandleApiCallAsFunction
[0x09476828+552]
01:07:46.927 1952   	v8::internal::Builtin_HandleApiCall [0x09476505+165]
01:07:46.927 1952   	v8::internal::StackGuard::ThreadLocal::Initialize
[0x0977A574+1108]
01:07:46.927 1952   	Mtxunlock [0x6D5A318D+13]
01:07:46.927 1952   	std::_Iterator_base12::_Adopt [0x0AB4E0D8+120]
01:07:46.934 3816 [35486/40916]
paint/selection/selection-within-composited-scroller.html failed unexpectedly
(renderer crashed).