Merge 176880 "Properly repaint RenderLayer's descendants when it..."

Merge 176880 "Properly repaint RenderLayer's descendants when it..."

> Properly repaint RenderLayer's descendants when it moves
> 
> When a RenderLayer moves, it can cause non-composited descendants of itself
> that are placed relatively to it to need to be repainted. These descandants
> may not have needed layout themselves, nor have they moved as far as the
> RenderLayer itself is concerned. This patch forces all descendant RenderLayers
> of a moved ancestor to at a minimum be checked by invalidateTreeAfterLayout
> to see if they need to be repainted.
> 
> Ideally we'd bail in markDescendantLayersMayNeedPaintInvalidation when
> we hit a composited layer, but because updateLayerPositions occurs before
> compositing update, this would be a chicken and egg problem.
> 
> BUG=385103
> 
> Review URL: https://codereview.chromium.org/354613003

TBR=leviw@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177867

[leviw_travelin_and_unemployed, 2014-07-10 18:32:37]

Committed patchset #1 manually as r177867.