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An ill-timed lost context could destroy the compositor context, while a
composite has been scheduled. This makes sure we reset
is_accelerated_compositing_active_ so that we don't try to use the 3D path in
this case.

BUG=None
TEST=Fullscreen with Pepper Flash on ARM devices


Review URL: http://codereview.chromium.org/7628023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96677 0039d316-1c4b-4281-b951-d872f2087c98