Intersection Observer support for OOPIF

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef RemoteFrameView_h
 #define RemoteFrameView_h
 
 #include "platform/Widget.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class RemoteFrame;
 
 class RemoteFrameView final : public Widget {
  public:
   static RemoteFrameView* create(RemoteFrame*);
 
   ~RemoteFrameView() override;
 
-  bool isRemoteFrameView() const override { return true; }
-  void setParent(Widget*) override;
-
   RemoteFrame& frame() const {
     ASSERT(m_remoteFrame);
     return *m_remoteFrame;
   }
 
+  // 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;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit RemoteFrameView(RemoteFrame*);
 
   // The properties and handling of the cycle between RemoteFrame
   // and its RemoteFrameView corresponds to that between LocalFrame
   // and FrameView. Please see the FrameView::m_frame comment for
   // details.
   Member<RemoteFrame> m_remoteFrame;
+
+  IntRect m_lastViewportIntersection;
 };
 
 DEFINE_TYPE_CASTS(RemoteFrameView,
                   Widget,
                   widget,
                   widget->isRemoteFrameView(),
                   widget.isRemoteFrameView());
 
 }  // namespace blink
 
 #endif  // RemoteFrameView_h