Merge 88386 - 2011-06-08 John Bauman <jbauman@chromium.org>

Merge 88386 - 2011-06-08  John Bauman  <jbauman@chromium.org>;

        Reviewed by James Robinson.

        Only draw portions of tiles in contentRect
        https://bugs.webkit.org/show_bug.cgi?id=62243

        * platform/chromium/test_expectations.txt:
        * compositing/repaint/shrink-layer.html: Added.
        * compositing/repaint/shrink-layer-expected.png: Added.
        * compositing/repaint/shrink-layer-expected.txt: Added.
2011-06-08  John Bauman  <jbauman@chromium.org>;

        Reviewed by James Robinson.

        Only draw portions of tiles in contentRect
        https://bugs.webkit.org/show_bug.cgi?id=62243

        Old garbage data can remain in tiles, so make sure to draw only those
        portions that are supposed to be drawn.

        Test: compositing/repaint/shrink-layer.html

        * platform/graphics/chromium/LayerTilerChromium.cpp:
        (WebCore::LayerTilerChromium::draw):

BUG=84901
TBR=jamesr@google.com
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=89275