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Old code was too restrictive, and did not properly select the correct quad.
New code chooses the topmost overlayable plane that does not intersect any
rects above it.

Review URL: https://codereview.chromium.org/440193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288049 0039d316-1c4b-4281-b951-d872f2087c98