[chromium] updateRect is incorrect when contentBounds != bounds

[chromium] updateRect is incorrect when contentBounds != bounds
https://bugs.webkit.org/show_bug.cgi?id=72919

Reviewed by James Robinson.

Source/WebCore:

Unit test added to TiledLayerChromiumTest.cpp

The m_updateRect member in LayerChromium types is used to track
what was painted for that layer. For tiled layers (especially
image layers), the updateRect was being given with respect to the
size of the content, rather than the size of the layer. This patch
adds a conversion so that updateRect is always with respect to the
layer size, so that damage tracking will work correctly in those
cases.

* platform/graphics/chromium/LayerChromium.h:
* platform/graphics/chromium/TiledLayerChromium.cpp:
(WebCore::TiledLayerChromium::updateCompositorResources):

Source/WebKit/chromium:

* tests/TiledLayerChromiumTest.cpp:
(WTF::FakeTiledLayerWithScaledBounds::FakeTiledLayerWithScaledBounds):
(WTF::FakeTiledLayerWithScaledBounds::setContentBounds):
(WTF::FakeTiledLayerWithScaledBounds::contentBounds):
(WTF::FakeTiledLayerWithScaledBounds::updateRect):
(WTF::TEST):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105680 268f45cc-cd09-0410-ab3c-d52691b4dbfc