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vollick@chromium.org authored
Avoids some asserts with ToT WebKit by using valid layers. Using all empty layers or resetting the root layer unnecessarily was causing problems. BUG=None TEST=compositor_unittest Review URL: http://codereview.chromium.org/8561014 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110935 0039d316-1c4b-4281-b951-d872f2087c98
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