Add GPU expectations for compositing tests (these appear to all be passes).

        * platform/chromium-gpu-mac/compositing/geometry/clipped-video-controller-expected.checksum:
        * platform/chromium-gpu-mac/compositing/geometry/clipped-video-controller-expected.png:
        * platform/chromium-gpu-mac/compositing/geometry/video-fixed-scrolling-expected.checksum:
        * platform/chromium-gpu-mac/compositing/geometry/video-fixed-scrolling-expected.png:
        * platform/chromium-gpu-mac/compositing/geometry/video-opacity-overlay-expected.checksum:
        * platform/chromium-gpu-mac/compositing/geometry/video-opacity-overlay-expected.png:
        * platform/chromium-gpu-mac/compositing/layers-inside-overflow-scroll-expected.checksum:
        * platform/chromium-gpu-mac/compositing/layers-inside-overflow-scroll-expected.png:
        * platform/chromium-gpu-mac/compositing/overflow/overflow-compositing-descendant-expected.checksum:
        * platform/chromium-gpu-mac/compositing/overflow/overflow-compositing-descendant-expected.png:
        * platform/chromium-gpu-mac/compositing/overflow/scroll-ancestor-update-expected.checksum:
        * platform/chromium-gpu-mac/compositing/overflow/scroll-ancestor-update-expected.png:
        * platform/chromium-gpu-mac/compositing/reflections/load-video-in-reflection-expected.checksum:
        * platform/chromium-gpu-mac/compositing/reflections/load-video-in-reflection-expected.png:
        * platform/chromium-gpu-mac/compositing/self-painting-layers-expected.checksum:
        * platform/chromium-gpu-mac/compositing/self-painting-layers-expected.png:
        * platform/chromium-gpu-mac/media/video-display-toggle-expected.checksum:
        * platform/chromium-gpu-mac/media/video-display-toggle-expected.png:
        * platform/chromium-gpu-mac/media/video-no-audio-expected.checksum:
        * platform/chromium-gpu-mac/media/video-no-audio-expected.png:
        * platform/chromium-gpu-mac/media/video-volume-slider-expected.checksum:
        * platform/chromium-gpu-mac/media/video-volume-slider-expected.png:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@82211 268f45cc-cd09-0410-ab3c-d52691b4dbfc