https://bugs.webkit.org/show_bug.cgi?id=126536

Reviewed by Simon Fraser.

* Configurations/WebKit2.xcconfig:
* UIProcess/API/mac/WKView.mm:
(-[WKView _updateViewExposedRect]):
* UIProcess/DrawingAreaProxy.cpp:
(WebKit::DrawingAreaProxy::DrawingAreaProxy):
(WebKit::DrawingAreaProxy::setExposedRect):
(WebKit::DrawingAreaProxy::exposedRectChangedTimerFired):
* UIProcess/DrawingAreaProxy.h:
(WebKit::DrawingAreaProxy::exposedRect):
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::WebPageProxy):
(WebKit::WebPageProxy::close):
* UIProcess/WebPageProxy.h:
Move exposedRect stuff from WebPageProxy to DrawingAreaProxy.

* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage):
Push the exposedRect down into WebCore.

* WebProcess/WebPage/DrawingArea.h:
* WebProcess/WebPage/DrawingArea.messages.in:
* WebProcess/WebPage/WebPage.cpp:
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:
* WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.h:
* WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm:
(WebKit::RemoteLayerTreeDrawingArea::RemoteLayerTreeDrawingArea):
(WebKit::RemoteLayerTreeDrawingArea::updateScrolledExposedRect):
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h:
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:
(WebKit::TiledCoreAnimationDrawingArea::TiledCoreAnimationDrawingArea):
(WebKit::TiledCoreAnimationDrawingArea::flushLayers):
(WebKit::TiledCoreAnimationDrawingArea::updateScrolledExposedRect):
(WebKit::TiledCoreAnimationDrawingArea::setRootCompositingLayer):
(WebKit::TiledCoreAnimationDrawingArea::createPageOverlayLayer):
(WebKit::TiledCoreAnimationDrawingArea::didCommitChangesForLayer):
Get rid of "clipsToExposedRect", we just use infinite-ness of the rect
to indicate that now.
Don't scroll an infinite rect; it won't work.

* WebCore.exp.in:
Export some things.

* page/FrameView.cpp:
(WebCore::FrameView::FrameView):
(WebCore::FrameView::setExposedRect):
Store the exposed rect on FrameView. When it changes, if the main frame
has a TiledBacking, inform it of the change.

* page/FrameView.h:
* platform/graphics/TiledBacking.h:
* platform/graphics/ca/mac/TileController.h:
* platform/graphics/ca/mac/TileController.mm:
(WebCore::TileController::TileController):
(WebCore::TileController::tilesWouldChangeForVisibleRect):
(WebCore::TileController::computeTileCoverageRect):
(WebCore::TileController::revalidateTiles):
(WebCore::TileController::updateTileCoverageMap):
Make use of the fact that we can test if a rect is infinite
instead of having a separate boolean property for that.

* rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::RenderLayerBacking):
(WebCore::computeTileCoverage):
Push the FrameView's cached exposed rect down into the TiledBacking when it is created.
We only support clipping for the main frame TileController for now.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161530 268f45cc-cd09-0410-ab3c-d52691b4dbfc