Give OOPIF FrameViews their own scroll animation timelines and hosts

third_party/WebKit/Source/web/WebPagePopupImpl.cpp

Index: third_party/WebKit/Source/web/WebPagePopupImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebPagePopupImpl.cpp b/third_party/WebKit/Source/web/WebPagePopupImpl.cpp
index 7e1d2c3d94fe15ea2b7235f99dde0f3d274f82f8..ef30de3ab41f025199562a739f7fde2de55bd984 100644
--- a/third_party/WebKit/Source/web/WebPagePopupImpl.cpp
+++ b/third_party/WebKit/Source/web/WebPagePopupImpl.cpp
@@ -395,7 +395,12 @@ void WebPagePopupImpl::setIsAcceleratedCompositingActive(bool enter) {
       m_isAcceleratedCompositingActive = true;
       m_animationHost = WTF::makeUnique<CompositorAnimationHost>(
           m_layerTreeView->compositorAnimationHost());
-      m_page->layerTreeViewInitialized(*m_layerTreeView);
+      m_page->layerTreeViewInitialized(*m_layerTreeView,
+                                       m_popupClient->ownerElement()
+                                           .document()
+                                           .frame()
+                                           ->localFrameRoot()
+                                           ->view());
     } else {
       m_isAcceleratedCompositingActive = false;
       m_animationHost = nullptr;
@@ -412,8 +417,14 @@ void WebPagePopupImpl::beginFrame(double lastFrameTimeMonotonic) {
 }
 
 void WebPagePopupImpl::willCloseLayerTreeView() {
-  if (m_page && m_layerTreeView)
-    m_page->willCloseLayerTreeView(*m_layerTreeView);
+  if (m_page && m_layerTreeView) {
+    m_page->willCloseLayerTreeView(*m_layerTreeView,
+                                   m_popupClient->ownerElement()
+                                       .document()
+                                       .frame()
+                                       ->localFrameRoot()
+                                       ->view());
+  }
 
   setIsAcceleratedCompositingActive(false);
   m_layerTreeView = nullptr;