[chromium] Don't ever skip drawing the non-composited content layer

[chromium] Don't ever skip drawing the non-composited content layer
https://bugs.webkit.org/show_bug.cgi?id=77236

Reviewed by James Robinson.

Source/WebCore:

Since the root layer has its textures potentially reserved last in a
front-to-back iteration, don't ever skip drawing it if we can't
reserve its textures. Instead, checkerboard and draw background color
quads instead to fill the viewport. This behavior is tied to the
backgroundFillsViewport setting.

* platform/graphics/chromium/TiledLayerChromium.cpp:
(WebCore::TiledLayerChromium::prepareToUpdateTiles):
* platform/graphics/chromium/cc/CCLayerTilingData.cpp:
(WebCore::CCLayerTilingData::reset):
* platform/graphics/chromium/cc/CCTiledLayerImpl.cpp:
(WebCore::CCTiledLayerImpl::appendQuads):

Source/WebKit/chromium:

This is a tiny fix. If the non-composited content layer never gets
painted, then the background color never gets set and it is just
opaque black.

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::setIsAcceleratedCompositingActive):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106160 268f45cc-cd09-0410-ab3c-d52691b4dbfc