The guts of the video renderer logic that relate to timing and queuing of frames have been moved into a base class.  This class now
simply interracts with the delegate to paint the current frame when a repaint is needed.
Review URL: http://codereview.chromium.org/20345

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10296 0039d316-1c4b-4281-b951-d872f2087c98