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While developing VideoFrameScheduler it became apparent that we no longer need to post tasks to notify the compositor as scheduling is already being done on the compositor thread. If there are no posted tasks, it also means we don't need to track dropped frames due to missed scheduler notifications.

BUG=110814

Review URL: https://codereview.chromium.org/251733005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266822 0039d316-1c4b-4281-b951-d872f2087c98