Add API for touchEventHandlerRegion to WebLayer
https://bugs.webkit.org/show_bug.cgi?id=101406

Patch by Yusuf Ozuysal <yusufo@google.com> on 2012-11-07
Reviewed by James Robinson.

These will be used to keep track of JavaScript touch event handlers from the compositor thread.

* chromium/public/WebLayer.h:
(WebKit::WebLayer::setTouchEventHandlerRegion):
(WebKit::WebLayer::touchEventHandlerRegion):
(WebLayer):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@133787 268f45cc-cd09-0410-ab3c-d52691b4dbfc