[chromium] Transform mouse/gesture event coordinates to account for pinch-zoom in compositor.
https://bugs.webkit.org/show_bug.cgi?id=100542

Reviewed by James Robinson.

Pinch-zoom in the compositor applies a transformation that WebCore does not know about.
We need to adjust mouse and gesture event coordinates to account for this in order that
hit testing work properly for these types while zoomed.

Source/Platform:

* chromium/public/WebLayerTreeView.h:
(WebLayerTreeView):
(WebKit::WebLayerTreeView::adjustPointForZoom): Adjusts point coordinated to account for zoom in compositor.

Source/WebKit/chromium:

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::handleInputEvent): Modified to adjoint event coordinates to account for zoom.


git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@132946 268f45cc-cd09-0410-ab3c-d52691b4dbfc