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The official solution to the problem where an IOSurface outlives
its bindings is to send a glBegin/glEnd pair down, which will
kick loose any references in the kernel.

BUG=158469


Review URL: https://chromiumcodereview.appspot.com/11418303

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170938 0039d316-1c4b-4281-b951-d872f2087c98