Disable 2D canvas switch to CPU rendering while backgrounded

Disable 2D canvas switch to CPU rendering while backgrounded

The switch to software rendering that happens when actively drawing to
a canvas while the containing page is in the background was cause the
compositing layer to get into a corrupted state.  This fix disables
the feature until a permanent solution can be found

BUG=591029
Committed: https://crrev.com/30569cfdd5902ae953a0a9e07d19d828c57f5f6f
Cr-Commit-Position: refs/heads/master@{#384990}

[Justin Novosad, 2016-04-04 16:59:25]

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

[Justin Novosad, 2016-04-04 16:59:26]

PTAL

[Stephen White, 2016-04-04 17:03:47]

LGTM

[Justin Novosad, 2016-04-04 20:13:12]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2016-04-04 20:14:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1857763002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1857763002/1

[commit-bot: I haz the power, 2016-04-04 20:20:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-04 20:21:36]

Description was changed from

==========
Disable 2D canvas switch to CPU rendering while backgrounded

The switch to software rendering that happens when actively drawing to
a canvas while the containing page is in the background was cause the
compositing layer to get into a corrupted state.  This fix disables
the feature until a permanent solution can be found

BUG=591029
==========

to

==========
Disable 2D canvas switch to CPU rendering while backgrounded

The switch to software rendering that happens when actively drawing to
a canvas while the containing page is in the background was cause the
compositing layer to get into a corrupted state.  This fix disables
the feature until a permanent solution can be found

BUG=591029

Committed: https://crrev.com/30569cfdd5902ae953a0a9e07d19d828c57f5f6f
Cr-Commit-Position: refs/heads/master@{#384990}
==========

[commit-bot: I haz the power, 2016-04-04 20:21:38]

Patchset 1 (id:??) landed as
https://crrev.com/30569cfdd5902ae953a0a9e07d19d828c57f5f6f
Cr-Commit-Position: refs/heads/master@{#384990}