http://trac.webkit.org/changeset/142141
https://bugs.webkit.org/show_bug.cgi?id=108990

Reland r142112, will update Chromium expectations and create a
Chromium bug instead for the crash.

.:

* ManualTests/remove-fixed-position-but-keep-compositing.html: Added.

Source/WebCore:

* CMakeLists.txt:
* Target.pri:
* WebCore.pri:
* page/scrolling/ScrollingCoordinator.cpp:
(WebCore::ScrollingCoordinator::create):
* page/scrolling/coordinatedgraphics/ScrollingCoordinatorCoordinatedGraphics.cpp: Added.
(WebCore):
(WebCore::ScrollingCoordinatorCoordinatedGraphics::ScrollingCoordinatorCoordinatedGraphics):
(WebCore::ScrollingCoordinatorCoordinatedGraphics::setLayerIsFixedToContainerLayer):
* page/scrolling/coordinatedgraphics/ScrollingCoordinatorCoordinatedGraphics.h: Added.
(WebCore):
(ScrollingCoordinatorCoordinatedGraphics):
* platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp:
(WebCore::CoordinatedGraphicsLayer::setFixedToViewport):
(WebCore):
(WebCore::CoordinatedGraphicsLayer::flushCompositingState):
* platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h:
(CoordinatedGraphicsLayerClient):
(CoordinatedGraphicsLayer):

Source/WebKit2:

* WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp:
* WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.h:
* WebProcess/WebPage/DrawingAreaImpl.cpp:
(WebKit::DrawingAreaImpl::DrawingAreaImpl):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142143 268f45cc-cd09-0410-ab3c-d52691b4dbfc