[chromium] Should schedule a commit when dropping contents textures

[chromium] Should schedule a commit when dropping contents textures
https://bugs.webkit.org/show_bug.cgi?id=90031

Patch by James Robinson <jamesr@chromium.org> on 2012-06-28
Reviewed by Adrienne Walker.

Source/WebCore:

If we're dropping contents textures on the impl thread, we need to schedule a commit to pick up new contents at
the next commit opportunity. Also adds some traces to make debugging issues like this easier.

* platform/graphics/chromium/cc/CCLayerTreeHostImpl.cpp:
(WebCore::CCLayerTreeHostImpl::commitComplete):
(WebCore::CCLayerTreeHostImpl::canDraw):
(WebCore::CCLayerTreeHostImpl::releaseContentsTextures):
* platform/graphics/chromium/cc/CCScheduler.cpp:
(WebCore::CCScheduler::processScheduledActions):

Source/WebKit/chromium:

Adds a somewhat vacuous test unit test for committing when releasing textures.

* tests/CCLayerTreeHostImplTest.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121450 268f45cc-cd09-0410-ab3c-d52691b4dbfc