Bug 976184 - Apply a drop shadow image filter to our SkPaint when drawing a surface with a shadow r=mattwoodrow
Bug 981252 - Initialize all values in MaskLayerUserData so that equality comparisons make sense. r=dbaron
Bug 981393 - Check against correct compositable types for old-textures. r=nical
Bug 981393 - Crash the child process if we get invalid Compositable updates. r=nical
Bug 940455 - Add LayerManager functonality to clear out a portion of the window for the OS to paint. r=roc,Bas