Fix crash in Canvas2DLayerBridge flushing + reliability metrics

Fix crash in Canvas2DLayerBridge flushing + reliability metrics

This change fixes a crash that occured when an SkSurface allocation
failure happened while switching a canvas to non-deferred rendering
mode. This failure induced an inconsistent state that was causing
a crash the next time the canvas was flushed. The allocation failure
that was causing the crash will now fail silently. New histogram
metrics will track the prevalence of these allocation failures.

BUG=576496
Committed: https://crrev.com/826ccd3c4bd0a6639fb70899cc94c33bc2dc9385
Cr-Commit-Position: refs/heads/master@{#369565}

[Justin Novosad, 2016-01-14 19:09:47]

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

[Justin Novosad, 2016-01-14 19:09:47]

PTAL

[Alexei Svitkine (slow), 2016-01-14 19:11:00]

histograms lgtm

[Stephen White, 2016-01-14 19:15:03]

LGTM

[Justin Novosad, 2016-01-14 19:15:17]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2016-01-14 19:15:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1581403004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1581403004/1

[Justin Novosad, 2016-01-14 20:42:03]

The CQ bit was checked by junov@chromium.org

[Justin Novosad, 2016-01-14 20:42:03]

The patchset sent to the CQ was uploaded after l-g-t-m from
senorblanco@chromium.org, asvitkine@chromium.org
Link to the patchset: https://codereview.chromium.org/1581403004/#ps20001
(title: "test fix")

[commit-bot: I haz the power, 2016-01-14 20:44:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1581403004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1581403004/20001

[commit-bot: I haz the power, 2016-01-14 22:10:33]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-01-14 22:12:32]

Description was changed from

==========
Fix crash in Canvas2DLayerBridge flushing + reliability metrics

This change fixes a crash that occured when an SkSurface allocation
failure happened while switching a canvas to non-deferred rendering
mode. This failure induced an inconsistent state that was causing
a crash the next time the canvas was flushed. The allocation failure
that was causing the crash will now fail silently. New histogram
metrics will track the prevalence of these allocation failures.

BUG=576496
==========

to

==========
Fix crash in Canvas2DLayerBridge flushing + reliability metrics

This change fixes a crash that occured when an SkSurface allocation
failure happened while switching a canvas to non-deferred rendering
mode. This failure induced an inconsistent state that was causing
a crash the next time the canvas was flushed. The allocation failure
that was causing the crash will now fail silently. New histogram
metrics will track the prevalence of these allocation failures.

BUG=576496

Committed: https://crrev.com/826ccd3c4bd0a6639fb70899cc94c33bc2dc9385
Cr-Commit-Position: refs/heads/master@{#369565}
==========

[commit-bot: I haz the power, 2016-01-14 22:12:33]

Patchset 2 (id:??) landed as
https://crrev.com/826ccd3c4bd0a6639fb70899cc94c33bc2dc9385
Cr-Commit-Position: refs/heads/master@{#369565}