Intersection Observer support for OOPIF

third_party/WebKit/Source/core/frame/RemoteFrameView.h

Index: third_party/WebKit/Source/core/frame/RemoteFrameView.h
diff --git a/third_party/WebKit/Source/core/frame/RemoteFrameView.h b/third_party/WebKit/Source/core/frame/RemoteFrameView.h
index 6f243f464f7c5972a4f090b18bb926f7df80110f..9f1f9f0561de434bfa1fd56db2e851817e66d0c1 100644
--- a/third_party/WebKit/Source/core/frame/RemoteFrameView.h
+++ b/third_party/WebKit/Source/core/frame/RemoteFrameView.h
@@ -19,23 +19,23 @@ class RemoteFrameView final : public Widget {
 
   ~RemoteFrameView() override;
 
-  bool isRemoteFrameView() const override { return true; }
-  void setParent(Widget*) override;
-
   RemoteFrame& frame() const {
     ASSERT(m_remoteFrame);
     return *m_remoteFrame;
   }
 
-  void dispose() override;
+  // Called on the view of a RemoteFrame with a LocalFrame parent, to update
+  // the viewport intersection in the process where the RemoteFrame is rendered.
+  void updateRemoteViewportIntersection();
+
+  bool isRemoteFrameView() const override { return true; }
+  void setParent(Widget*) override;
 
+  void dispose() override;
   // Override to notify remote frame that its viewport size has changed.
   void frameRectsChanged() override;
-
   void invalidateRect(const IntRect&) override;
-
   void setFrameRect(const IntRect&) override;
-
   void hide() override;
   void show() override;
   void setParentVisible(bool) override;
@@ -50,6 +50,8 @@ class RemoteFrameView final : public Widget {
   // and FrameView. Please see the FrameView::m_frame comment for
   // details.
   Member<RemoteFrame> m_remoteFrame;
+
+  IntRect m_lastViewportIntersection;
 };
 
 DEFINE_TYPE_CASTS(RemoteFrameView,