Adding some nullptr checks around calls to Canvas2DLayerBridge::getOrCreateSurface

Adding some nullptr checks around calls to Canvas2DLayerBridge::getOrCreateSurface

This change is to make canvas more resilient to memory allocation
failures and GPU context losses by dropping content instead of
crashing the render process.

BUG=569971
Committed: https://crrev.com/c014bf5e07c6d9f7e2b4945b95d762b296177675
Cr-Commit-Position: refs/heads/master@{#365331}

[Justin Novosad, 2015-12-15 18:55:55]

junov@chromium.org changed reviewers:
+ senorblanco@chromium.org

[Justin Novosad, 2015-12-15 18:55:55]

PTAL

https://codereview.chromium.org/1529903002/diff/1/third_party/WebKit/Source/p...
File third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp (left):

https://codereview.chromium.org/1529903002/diff/1/third_party/WebKit/Source/p...
third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp:566: if
(!checkSurfaceValid())
This check is expensive and was redundant with the same check being done in
newImageSnapshot()

[Stephen White, 2015-12-15 19:06:35]

LGTM

[Justin Novosad, 2015-12-15 19:08:54]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2015-12-15 19:10:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1529903002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1529903002/1

[commit-bot: I haz the power, 2015-12-15 21:32:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-15 21:32:42]

Description was changed from

==========
Adding some nullptr checks around calls to
Canvas2DLayerBridge::getOrCreateSurface

This change is to make canvas more resilient to memory allocation
failures and GPU context losses by dropping content instead of
crashing the render process.

BUG=569971
==========

to

==========
Adding some nullptr checks around calls to
Canvas2DLayerBridge::getOrCreateSurface

This change is to make canvas more resilient to memory allocation
failures and GPU context losses by dropping content instead of
crashing the render process.

BUG=569971

Committed: https://crrev.com/c014bf5e07c6d9f7e2b4945b95d762b296177675
Cr-Commit-Position: refs/heads/master@{#365331}
==========

[commit-bot: I haz the power, 2015-12-15 21:32:43]

Patchset 1 (id:??) landed as
https://crrev.com/c014bf5e07c6d9f7e2b4945b95d762b296177675
Cr-Commit-Position: refs/heads/master@{#365331}