Intersection Observer support for OOPIF

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

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index fba3907f684131b3dfda7eb454f571bef5593ffa..f15527a692366bc9bbbafa34f678b25890d38778 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -755,6 +755,12 @@ class CORE_EXPORT FrameView final
   // Only for SPv2.
   std::unique_ptr<JSONObject> compositedLayersAsJSON(LayerTreeFlags);
 
+  // Called on a view for a LocalFrame with a RemoteFrame parent. This makes
+  // viewport intersection available that accounts for remote ancestor frames
+  // and their respective scroll positions, clips, etc.
+  void setViewportIntersectionFromParent(const IntRect&);
+  IntRect remoteViewportIntersection();
+
  protected:
   // Scroll the content via the compositor.
   bool scrollContentsFastPath(const IntSize& scrollDelta);
@@ -1104,6 +1110,8 @@ class CORE_EXPORT FrameView final
 
   Member<ElementVisibilityObserver> m_visibilityObserver;
 
+  IntRect m_remoteViewportIntersection;
+
   // For testing.
   struct ObjectPaintInvalidation {
     String name;