Implement scrolling in Pepper. This does simple scrolling of the backing store in the renderer, and just invalidates that region so it's repainted by WebKit.
Implement scrolling in Pepper. This does simple scrolling of the backing store
in the renderer, and just invalidates that region so it's repainted by WebKit.

TEST=covered by ppapi unit test (to be enabled)
BUG=none
Review URL: http://codereview.chromium.org/2909017

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@52444 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser