Implement coordinated scrollbar for subframes and overflow:scroll

Implement coordinated scrollbar for subframes and overflow:scroll
https://bugs.webkit.org/show_bug.cgi?id=109560

Patch by Tien-Ren Chen <trchen@chromium.org> on 2013-02-26
Reviewed by James Robinson.

Source/WebCore:

This patch obsoletes ScrollingCoordinatorPrivate for the Chromium
implementation. Also removes the concept of a single main scrolling
layer. Should use HashMap to keep track resources for multiple
scrollable objects.

Many of the callbacks are extended to support ScrollableArea instead
of just FrameView. Now ScrollingCoordinatorChromium coordinates
scrollbars for both subframes and overflow:scroll.

Some drive-by change:
1. Remove the GraphicsLayer parameter for layer change callbacks.
   Should be able to get the latest layer from the ScrollableArea anyway.
2. Should start from main frame document when updating touch event target rects.

New chromium test: ScrollingCoordinatorChromiumTest.iframeScrolling

* page/Frame.cpp:
(WebCore::Frame::willDetachPage):
* page/FrameView.cpp:
(WebCore::FrameView::prepareForDetach):
(WebCore::FrameView::layerForScrolling):
(WebCore):
* page/FrameView.h:
(FrameView):
* page/scrolling/ScrollingCoordinator.cpp:
(WebCore::ScrollingCoordinator::scrollLayerForScrollableArea):
(WebCore):
(WebCore::ScrollingCoordinator::horizontalScrollbarLayerForScrollableArea):
(WebCore::ScrollingCoordinator::verticalScrollbarLayerForScrollableArea):
* page/scrolling/ScrollingCoordinator.h:
(WebCore::ScrollingCoordinator::willDestroyScrollableArea):
(WebCore::ScrollingCoordinator::scrollableAreaScrollLayerDidChange):
(WebCore::ScrollingCoordinator::scrollableAreaScrollbarLayerDidChange):
(ScrollingCoordinator):
* page/scrolling/chromium/ScrollingCoordinatorChromium.cpp:
(WebCore::scrollingWebLayerForGraphicsLayer):
(WebCore::ScrollingCoordinatorChromium::scrollingWebLayerForScrollableArea):
(WebCore::ScrollingCoordinatorChromium::ScrollingCoordinatorChromium):
(WebCore::ScrollingCoordinatorChromium::~ScrollingCoordinatorChromium):
(WebCore::ScrollingCoordinatorChromium::frameViewLayoutUpdated):
(WebCore::ScrollingCoordinatorChromium::touchEventTargetRectsDidChange):
(WebCore::createScrollbarLayer):
(WebCore::detachScrollbarLayer):
(WebCore::setupScrollbarLayer):
(WebCore::ScrollingCoordinatorChromium::willDestroyScrollableArea):
(WebCore::ScrollingCoordinatorChromium::scrollableAreaScrollbarLayerDidChange):
(WebCore::ScrollingCoordinatorChromium::setNonFastScrollableRegion):
(WebCore::ScrollingCoordinatorChromium::setTouchEventTargetRects):
(WebCore::ScrollingCoordinatorChromium::setWheelEventHandlerCount):
(WebCore::ScrollingCoordinatorChromium::setShouldUpdateScrollLayerPositionOnMainThread):
(WebCore::ScrollingCoordinatorChromium::setLayerIsContainerForFixedPositionLayers):
(WebCore::ScrollingCoordinatorChromium::setLayerIsFixedToContainerLayer):
(WebCore::ScrollingCoordinatorChromium::scrollableAreaScrollLayerDidChange):
(WebCore::ScrollingCoordinatorChromium::addWebScrollbarLayer):
(WebCore):
(WebCore::ScrollingCoordinatorChromium::getWebScrollbarLayer):
(WebCore::ScrollingCoordinatorChromium::removeWebScrollbarLayer):
* page/scrolling/chromium/ScrollingCoordinatorChromium.h:
(WebCore):
(ScrollingCoordinatorChromium):
* page/scrolling/mac/ScrollingCoordinatorMac.h:
(ScrollingCoordinatorMac):
* page/scrolling/mac/ScrollingCoordinatorMac.mm:
(WebCore::ScrollingCoordinatorMac::scrollableAreaScrollbarLayerDidChange):
* platform/ScrollableArea.h:
(ScrollableArea):
(WebCore::ScrollableArea::layerForScrolling):
* platform/graphics/GraphicsLayer.h:
(GraphicsLayer):
(WebCore::GraphicsLayer::setContentsToPlatformLayer):
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::~RenderLayer):
(WebCore::RenderLayer::layerForScrolling):
(WebCore):
* rendering/RenderLayer.h:
(RenderLayer):
* rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::updateOverflowControlsLayers):
(WebCore::RenderLayerBacking::positionOverflowControlsLayers):
(WebCore::RenderLayerBacking::updateScrollingLayers):
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::frameViewDidScroll):
(WebCore::RenderLayerCompositor::scrollingLayerDidChange):
(WebCore::RenderLayerCompositor::updateOverflowControlsLayers):

Source/WebKit/chromium:

Added ScrollingCoordinatorChromiumTest.iframeScrolling to verify
impl-side scrolling and impl-side scrollbars for frames.

Update ScrollingCoordinatorChromiumTest.overflowScrolling to verify
impl-side scrollbars.

* tests/ScrollingCoordinatorChromiumTest.cpp:
(WebKit::ScrollingCoordinatorChromiumTest::ScrollingCoordinatorChromiumTest):
(WebKit::TEST_F):
(WebKit):
* tests/data/iframe-scrolling-inner.html: Added.
* tests/data/iframe-scrolling.html: Added.

LayoutTests:

Coordinated scrollbars changes drawsContent flag on scrollbar GraphicsLayers,
test expectation are updated.

* platform/chromium-linux/compositing/iframes/become-overlapped-iframe-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/composited-parent-iframe-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/connect-compositing-iframe-delayed-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/connect-compositing-iframe-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/connect-compositing-iframe2-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/connect-compositing-iframe3-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/enter-compositing-iframe-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/iframe-resize-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/iframe-size-from-zero-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/invisible-nested-iframe-show-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/overlapped-iframe-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/resizer-expected.txt: Added.
* platform/chromium-linux/compositing/iframes/scrolling-iframe-expected.txt: Added.
* platform/chromium-linux/compositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/compositing/overflow/scrolling-content-clip-to-viewport-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt:
* platform/chromium-linux/compositing/overflow/textarea-scroll-touch-expected.txt: Added.
* platform/chromium-linux/compositing/overflow/updating-scrolling-content-expected.txt:
* platform/chromium-linux/compositing/rtl/rtl-iframe-absolute-overflow-expected.txt: Added.
* platform/chromium-linux/compositing/rtl/rtl-iframe-absolute-overflow-scrolled-expected.txt: Added.
* platform/chromium-linux/compositing/rtl/rtl-iframe-fixed-overflow-expected.txt: Added.
* platform/chromium-linux/compositing/rtl/rtl-iframe-fixed-overflow-scrolled-expected.txt: Added.
* platform/chromium-linux/platform/chromium/compositing/force-compositing-mode/overflow-iframe-enter-compositing-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/composited-scrolling-creates-a-stacking-container-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/overflow-auto-with-touch-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/overflow-auto-with-touch-toggle-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/overflow-overlay-with-touch-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/scrolling-content-clip-to-viewport-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/scrolling-without-painting-expected.txt:
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/textarea-scroll-touch-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/gpu/compositedscrolling/overflow/updating-scrolling-content-expected.txt:
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/become-overlapped-iframe-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/composited-parent-iframe-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/connect-compositing-iframe-delayed-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/connect-compositing-iframe-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/connect-compositing-iframe2-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/connect-compositing-iframe3-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/enter-compositing-iframe-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/iframe-resize-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/iframe-size-from-zero-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/invisible-nested-iframe-show-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/overlapped-iframe-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/resizer-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/iframes/scrolling-iframe-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/overflow/scrolling-content-clip-to-viewport-expected.txt: Copied from LayoutTests/platform/chromium-linux/compositing/overflow/scrolling-without-painting-expected.txt.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/overflow/scrolling-without-painting-expected.txt:
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/overflow/textarea-scroll-touch-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/overflow/updating-scrolling-content-expected.txt:
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/rtl/rtl-iframe-absolute-overflow-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/rtl/rtl-iframe-absolute-overflow-scrolled-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/rtl/rtl-iframe-fixed-overflow-expected.txt: Added.
* platform/chromium-linux/platform/chromium/virtual/softwarecompositing/rtl/rtl-iframe-fixed-overflow-scrolled-expected.txt: Added.
* platform/chromium/TestExpectations:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@144024 268f45cc-cd09-0410-ab3c-d52691b4dbfc