Bug 877726 - Convert FrameMetrics.mScrollOffset to be a CSSPoint. r=kentuckyfriedtakahe
Bug 867770 - Layerize all animated images. r=mattwoodrow
Bug 867770 - Add a pref as to whether we layerize animated images, disabled by default. r=mattwoodrow
Bug 867770 - Test to make sure that animated images are layerized correctly when the pref is enabled. r=mattwoodrow