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 d8f183533b304cbc72c827789d3e7ae11255013c..7e538e9ecdb4f8dede170aaa0faa07090e8c974a 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -730,6 +730,15 @@ 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& viewportIntersection,
+                                         const IntPoint& rootOffset);
+  IntRect remoteViewportIntersection();
+
+  IntRect viewportIntersection();
+
  protected:
   // Scroll the content via the compositor.
   bool scrollContentsFastPath(const IntSize& scrollDelta);
@@ -1063,6 +1072,9 @@ class CORE_EXPORT FrameView final
   bool m_suppressAdjustViewSize;
   bool m_allowsLayoutInvalidationAfterLayoutClean;
 
+  IntRect m_remoteViewportIntersection;
+  IntPoint m_remoteRootOffset;
+
   // For testing.
   struct ObjectPaintInvalidation {
     String name;