[chromium] Push CCLayerIteratorPosition struct into CCLayerIterator class.

[chromium] Push CCLayerIteratorPosition struct into CCLayerIterator class.
https://bugs.webkit.org/show_bug.cgi?id=75864

Patch by Dana Jansens <danakj@chromium.org> on 2012-02-23
Reviewed by James Robinson.

* platform/graphics/chromium/cc/CCLayerIterator.cpp:
(WebCore::CCLayerIteratorActions::BackToFront::begin):
(WebCore::CCLayerIteratorActions::BackToFront::end):
(WebCore::CCLayerIteratorActions::BackToFront::next):
(WebCore::CCLayerIteratorActions::FrontToBack::begin):
(WebCore::CCLayerIteratorActions::FrontToBack::end):
(WebCore::CCLayerIteratorActions::FrontToBack::next):
(WebCore::CCLayerIteratorActions::FrontToBack::goToHighestInSubtree):
* platform/graphics/chromium/cc/CCLayerIterator.h:
(WebCore::CCLayerIterator::CCLayerIterator):
(WebCore::CCLayerIterator::operator++):
(WebCore::CCLayerIterator::operator==):
(WebCore::CCLayerIterator::operator->):
(WebCore::CCLayerIterator::operator*):
(WebCore::CCLayerIterator::representsTargetRenderSurface):
(WebCore::CCLayerIterator::representsContributingRenderSurface):
(WebCore::CCLayerIterator::currentLayer):
(WebCore::CCLayerIterator::currentLayerRepresentsContributingRenderSurface):
(WebCore::CCLayerIterator::currentLayerRepresentsTargetRenderSurface):
(WebCore::CCLayerIterator::targetRenderSurfaceLayer):
(WebCore::CCLayerIterator::targetRenderSurface):
(WebCore::CCLayerIterator::targetRenderSurfaceChildren):
* platform/graphics/chromium/cc/CCLayerIteratorPosition.h: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108678 268f45cc-cd09-0410-ab3c-d52691b4dbfc