Give OOPIF FrameViews their own scroll animation timelines and hosts

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index d56224c2612f383813407fadac64037f003bbac2..1cdb25ed3a287efb4d2e0969c3fb36b72f033199 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -1882,18 +1882,12 @@ void PaintLayerScrollableArea::resetRebuildScrollbarLayerFlags() {
 
 CompositorAnimationHost* PaintLayerScrollableArea::compositorAnimationHost()
     const {
-  if (ScrollingCoordinator* coordinator = getScrollingCoordinator())
-    return coordinator->compositorAnimationHost();
-
-  return nullptr;
+  return m_layer.layoutObject()->frameView()->compositorAnimationHost();
 }
 
 CompositorAnimationTimeline*
 PaintLayerScrollableArea::compositorAnimationTimeline() const {
-  if (ScrollingCoordinator* coordinator = getScrollingCoordinator())
-    return coordinator->compositorAnimationTimeline();
-
-  return nullptr;
+  return m_layer.layoutObject()->frameView()->compositorAnimationTimeline();
 }
 
 PaintLayerScrollableArea*