Revert 138188

Revert 138188
> Merge 137939
> > Add support for tracking hit test rectangles to enable fast event rejection in the compositor
> > https://bugs.webkit.org/show_bug.cgi?id=103914
> > 
> > Reviewed by James Robinson.
> > 
> > Source/WebCore:
> > 
> > Adding support for tracking hit test target regions for the purpose of performing initial hit testing
> > in the compositor to avoid blocking scrolling on the main thread while waiting to hit test events that
> > aren't occuring in regions with handlers. This is initially being done to avoid having to go to the main
> > thread when scrolling by flicking on touch devices when the flick occurs outside a tracked touch event
> > region. This patch includes the implementation to turn this on in Chromium.
> > 
> > To accomplish this goal, Document will now keep a counted hash set of nodes with touch event handlers
> > instead of only an unsigned integer of the total count. ScrollingCoordinator then updates the compositor
> > when new touch event handlers are registered or removed, or after layout much like how
> > nonFastScrollableRegions are currently tracked.
> > 
> > This implementation will not properly update the hit test rects when the renderers are inside a sub-
> > tree that scrolls.
> > 
> > This change was initially rolled out due to stale Node pointers in Document's touchEventTargets. This
> > patch adds a callback to remove the Node from that structure to Node's destructor. This is covered
> > by the touch-target-removed-crash.html test case which is also added.
> > 
> > Test: platform/chromium/fast/events/touch/compositor-touch-hit-rects.html
> >       platform/chromium/fast/events/touch/touch-target-removed-crash.html
> > 
> > * dom/Document.cpp:
> > (WebCore::Document::Document): Added a HashCountedSet of touch target nodes. Note: DOMWindow targets
> > are stored as the Document they point to.
> > (WebCore::Document::didAddTouchEventHandler): Changed to keep track of the handler instead of a count, and
> > to update the ScrollingCoordinator with the change.
> > (WebCore::Document::didRemoveTouchEventHandler): Ditto.
> > * dom/Document.h:
> > (WebCore::Document::hasTouchEventHandlers): It's no longer O(1) to get the count of touch handlers, so
> > expose whether there are any or not.
> > (WebCore::Document::touchEventTargets):
> > * dom/Node.cpp:
> > (WebCore::Node::didMoveToNewDocument):
> > (WebCore::tryAddEventListener):
> > (WebCore::tryRemoveEventListener):
> > * history/CachedFrame.cpp:
> > (WebCore::CachedFrameBase::restore):
> > * html/HTMLInputElement.cpp:
> > (WebCore::HTMLInputElement::~HTMLInputElement):
> > (WebCore::HTMLInputElement::updateType):
> > * page/DOMWindow.cpp:
> > (WebCore::DOMWindow::addEventListener): Add the Document to the touch target set instead of DOMWindow.
> > (WebCore::DOMWindow::removeEventListener):
> > * page/EventHandler.cpp:
> > (WebCore::EventHandler::handleTouchEvent):
> > * page/Frame.cpp:
> > (WebCore::Frame::setDocument):
> > * page/scrolling/ScrollingCoordinator.cpp:
> > (WebCore::ScrollingCoordinator::computeAbsoluteTouchEventTargetRects): Walk the renderers for event handler
> > nodes and generate the absolute hit testing rects.
> > * page/scrolling/ScrollingCoordinator.h:
> > (WebCore::ScrollingCoordinator::setTouchEventTargetRectsChanged): Hook to pass along the hit test rects to
> > the scrolling tree/compositor.
> > (ScrollingCoordinator):
> > * page/scrolling/chromium/ScrollingCoordinatorChromium.cpp:
> > (WebCore::ScrollingCoordinatorChromium::frameViewLayoutUpdated):
> > (WebCore::ScrollingCoordinatorChromium::setTouchEventTargetRectsChanged):
> > (WebCore::ScrollingCoordinatorChromium::setNonFastScrollableRegion):
> > (WebCore::ScrollingCoordinatorChromium::setTouchEventTargetRects):
> > * page/scrolling/chromium/ScrollingCoordinatorChromium.h:
> > (ScrollingCoordinatorChromium):
> > * testing/Internals.cpp:
> > (WebCore::Internals::touchEventHandlerCount): Changed to do the work to calculate the actual count since
> > it's no longer stored as an int in Document.
> > (WebCore::Internals::touchEventTargetClientRects):
> > * testing/Internals.h:
> > (Internals):
> > * testing/Internals.idl:
> > 
> > Source/WebKit/chromium:
> > 
> > Enabling touch event target region tracking.
> > 
> > * features.gypi:
> > * src/WebPluginContainerImpl.cpp:
> > (WebKit::WebPluginContainerImpl::requestTouchEventType):
> > (WebKit::WebPluginContainerImpl::~WebPluginContainerImpl):
> > 
> > LayoutTests:
> > 
> > * platform/chromium/fast/events/touch/compositor-touch-hit-rects-expected.txt: Added.
> > * platform/chromium/fast/events/touch/compositor-touch-hit-rects.html: Added.
> > * platform/chromium/fast/events/touch/touch-target-removed-crash-expected.txt: Added.
> > * platform/chromium/fast/events/touch/touch-target-removed-crash.html: Added.
> > 
> 
> TBR=leviw@chromium.org
> Review URL: https://codereview.chromium.org/11635024

TBR=leviw@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=138209