With bug 711867 we only repaint the dirty region, but for this fallback path we need to do the front->back update of what was repainted.
Created attachment 584998 [details] [diff] [review]
Synchronize back/front buffers in gonk fallback path
Created attachment 585003 [details] [diff] [review]
Synchronize back/front buffers in gonk fallback path, v2
Also sets the clipping region for the GL path, which I should have noticed in review.
(Made a local change to