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trchen@chromium.org authored
This CL fixes a bug that non-composited scrolling div forgets to invalidate because the div believed all its descandants are composited, when actually some descendants paints to ancestor backing although composited. BUG=401047 Review URL: https://codereview.chromium.org/460883002 git-svn-id: svn://svn.chromium.org/blink/trunk@180309 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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