http://trac.webkit.org/changeset/161447
https://bugs.webkit.org/show_bug.cgi?id=126592

needs some more work (Requested by thorton on #webkit).

Source/WebCore:

* WebCore.exp.in:
* page/FrameView.cpp:
(WebCore::FrameView::FrameView):
* page/FrameView.h:
* platform/graphics/GraphicsLayerClient.h:
* platform/graphics/TiledBacking.h:
* platform/graphics/ca/GraphicsLayerCA.h:
* platform/graphics/ca/PlatformCALayerClient.h:
* platform/graphics/ca/mac/TileController.h:
* platform/graphics/ca/mac/TileController.mm:
(WebCore::TileController::TileController):
(WebCore::TileController::tilesWouldChangeForVisibleRect):
(WebCore::TileController::setExposedRect):
(WebCore::TileController::setClipsToExposedRect):
(WebCore::TileController::computeTileCoverageRect):
(WebCore::TileController::revalidateTiles):
(WebCore::TileController::updateTileCoverageMap):
* rendering/RenderLayerBacking.cpp:
(WebCore::computeTileCoverage):
* rendering/RenderLayerBacking.h:

Source/WebKit2:

* UIProcess/API/mac/WKView.mm:
(-[WKView _updateViewExposedRect]):
* UIProcess/DrawingAreaProxy.cpp:
(WebKit::DrawingAreaProxy::DrawingAreaProxy):
* UIProcess/DrawingAreaProxy.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::WebPageProxy):
(WebKit::WebPageProxy::close):
(WebKit::WebPageProxy::viewExposedRectChanged):
(WebKit::WebPageProxy::exposedRectChangedTimerFired):
* UIProcess/WebPageProxy.h:
(WebKit::WebPageProxy::viewExposedRect):
* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage):
* WebProcess/WebPage/DrawingArea.h:
(WebKit::DrawingArea::setExposedRect):
(WebKit::DrawingArea::setClipsToExposedRect):
* WebProcess/WebPage/DrawingArea.messages.in:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::viewExposedRectChanged):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:
* WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h:
* WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm:
(WebKit::RemoteLayerTreeDrawingArea::RemoteLayerTreeDrawingArea):
(WebKit::RemoteLayerTreeDrawingArea::setClipsToExposedRect):
(WebKit::RemoteLayerTreeDrawingArea::updateScrolledExposedRect):
(WebKit::RemoteLayerTreeDrawingArea::updateMainFrameClipsToExposedRect):
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h:
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:
(WebKit::TiledCoreAnimationDrawingArea::TiledCoreAnimationDrawingArea):
(WebKit::TiledCoreAnimationDrawingArea::flushLayers):
(WebKit::TiledCoreAnimationDrawingArea::setClipsToExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::updateScrolledExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::updateMainFrameClipsToExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::setRootCompositingLayer):
(WebKit::TiledCoreAnimationDrawingArea::createPageOverlayLayer):
(WebKit::TiledCoreAnimationDrawingArea::didCommitChangesForLayer):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161452 268f45cc-cd09-0410-ab3c-d52691b4dbfc