[Chromium] Expose compositedScrollingForFramesEnabled setting in WebKit API
https://bugs.webkit.org/show_bug.cgi?id=106262

Reviewed by James Robinson.

* public/WebSettings.h:
* src/WebSettingsImpl.cpp:
(WebKit::WebSettingsImpl::setCompositedScrollingForFramesEnabled):
(WebKit):
* src/WebSettingsImpl.h:
(WebSettingsImpl):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139028 268f45cc-cd09-0410-ab3c-d52691b4dbfc