value explicitly after creating a layer, or setting its delegate.
https://bugs.webkit.org/show_bug.cgi?id=68295

Patch by Antoine Labour <piman@chromium.org> on 2011-09-23
Reviewed by James Robinson.

Covered by compositing/ layeout tests.

* platform/graphics/chromium/GraphicsLayerChromium.cpp:
(WebCore::GraphicsLayerChromium::setContentsToCanvas):
(WebCore::GraphicsLayerChromium::setContentsToMedia):
(WebCore::GraphicsLayerChromium::updateLayerPreserves3D):
(WebCore::GraphicsLayerChromium::setupContentsLayer):
* platform/graphics/chromium/GraphicsLayerChromium.h:
* platform/graphics/chromium/LayerChromium.cpp:
(WebCore::LayerChromium::LayerChromium):
* platform/graphics/chromium/LayerChromium.h:
(WebCore::LayerChromium::setPreserves3D):
(WebCore::LayerChromium::preserves3D):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95886 268f45cc-cd09-0410-ab3c-d52691b4dbfc