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This maps the behavior of the old compositor.

BUG=None
TEST=Resize window with accelerated content. Observe no "trailing" of the content on the borders.


Review URL: http://codereview.chromium.org/8590021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110512 0039d316-1c4b-4281-b951-d872f2087c98