Merge 76437 - 2011-01-22 Adrienne Walker <enne@google.com>...

Merge 76437 - 2011-01-22  Adrienne Walker  <enne@google.com>;

        Reviewed by James Robinson.

        [chromium] Fix compositor repaints for offscreen fixed elements
        https://bugs.webkit.org/show_bug.cgi?id=52681

        The fast path scrolling was clipping offscreen invalidations.
        Additionally, the compositor was ignoring all invalidations that were
        entirely out of the content rect.

        Test: compositing/ to verify this caused no regressions.
        Tested fix manually in browser as I could not generate a LayoutTest that reproduced the bug in run-webkit-tests.

        * page/FrameView.cpp:
        (WebCore::FrameView::scrollContentsFastPath):
        * platform/graphics/chromium/LayerRendererChromium.cpp:
        (WebCore::LayerRendererChromium::invalidateRootLayerRect):

TBR=enne@google.com

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=81033