Check whether a touchDown lands on a registered touch event handler from the compositor
https://bugs.webkit.org/show_bug.cgi?id=104863

Patch by Yusuf Ozuysal <yusufo@google.com> on 2012-12-13
Reviewed by James Robinson.

* src/WebCompositorInputHandlerImpl.cpp:
(WebKit::WebCompositorInputHandlerImpl::handleInputEventInternal):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@137616 268f45cc-cd09-0410-ab3c-d52691b4dbfc