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Previous code was resizing, and clearing the front buffer as soon as the back
buffer was resized. It can lead to race conditions where the compositor draws a
black texture if it triggers between the resize and the swap.

BUG=None
TEST=Pepper Flash


Review URL: http://codereview.chromium.org/7795015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98905 0039d316-1c4b-4281-b951-d872f2087c98