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
Review URL: https://codereview.chromium.org/1857763002

Cr-Commit-Position: refs/heads/master@{#384990}
(cherry picked from commit 30569cfdd5902ae953a0a9e07d19d828c57f5f6f)

Committed: https://chromium.googlesource.com/chromium/src/+/06bb6cf8eb3c04254e4f5187a644ddb086b7afcc

[Justin Novosad, 2016-04-08 19:08:04]

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

Review URL: https://codereview.chromium.org/1857763002

Cr-Commit-Position: refs/heads/master@{#384990}
(cherry picked from commit 30569cfdd5902ae953a0a9e07d19d828c57f5f6f)
==========

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

Review URL: https://codereview.chromium.org/1857763002

Cr-Commit-Position: refs/heads/master@{#384990}
(cherry picked from commit 30569cfdd5902ae953a0a9e07d19d828c57f5f6f)

Committed:
https://chromium.googlesource.com/chromium/src/+/06bb6cf8eb3c04254e4f5187a644...
==========

[Justin Novosad, 2016-04-08 19:08:05]

Committed patchset #1 (id:1) manually as
06bb6cf8eb3c04254e4f5187a644ddb086b7afcc (tree was closed).