https://bugs.webkit.org/show_bug.cgi?id=119462
<rdar://problem/14607548>

Reviewed by Simon Fraser.

Source/WebCore:

Bug 119461 (http://wkb.ug/119461) describes how a directly composited
background color can intersect with its children. It's not clear exactly
what the best way to fix that is, but for the moment we should disallow
any element that has perspective or a preserve-3d transform style from
getting a directly composited background.

Test: compositing/background-color/no-composited-background-color-when-perspective.html

* rendering/RenderLayerBacking.cpp:
(WebCore::hasPerspectiveOrPreserves3D): New static helper.
(WebCore::supportsDirectBoxDecorationsComposition): Return false if the above function is true.

LayoutTests:

* compositing/background-color/no-composited-background-color-when-perspective-expected.html: Added.
* compositing/background-color/no-composited-background-color-when-perspective.html: Added.
* compositing/geometry/preserve-3d-switching-expected.txt: Rebaselined.
* compositing/overflow-trumps-transform-style-expected.txt: Rebaselined.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153681 268f45cc-cd09-0410-ab3c-d52691b4dbfc