Add support for pinch gesture processing in the MT compositor.

Add support for pinch gesture processing in the MT compositor.
https://bugs.webkit.org/show_bug.cgi?id=77804

Patch by Sadrul Habib Chowdhury <sadrul@chromium.org> on 2012-02-08
Reviewed by James Robinson.

* public/WebInputEvent.h:
* src/WebCompositorInputHandlerImpl.cpp:
(WebKit::WebCompositorInputHandlerImpl::WebCompositorInputHandlerImpl):
(WebKit::WebCompositorInputHandlerImpl::handleInputEvent):
* src/WebCompositorInputHandlerImpl.h:
(WebCompositorInputHandlerImpl):
* src/WebInputEventConversion.cpp:
(WebKit::PlatformGestureEventBuilder::PlatformGestureEventBuilder):
* src/WebPopupMenuImpl.cpp:
(WebKit::WebPopupMenuImpl::handleInputEvent):
* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::handleInputEvent):
* tests/WebCompositorInputHandlerImplTest.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@107125 268f45cc-cd09-0410-ab3c-d52691b4dbfc