Add PlatformFrameView class.

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 662 matching lines @@
                                    const IntRect&) const {}
 
 LocalFrame* VisualViewport::MainFrame() const {
   return GetPage().MainFrame() && GetPage().MainFrame()->IsLocalFrame()
              ? GetPage().DeprecatedLocalMainFrame()
              : 0;
 }
 
 bool VisualViewport::ScheduleAnimation() {
   if (PlatformChromeClient* client = GetChromeClient()) {
-    client->ScheduleAnimation(MainFrame());
+    client->ScheduleAnimation(MainFrame()->View());
     return true;
   }
   return false;
 }
 
 void VisualViewport::ClampToBoundaries() {
   SetLocation(FloatPoint(offset_));
 }
 
 FloatRect VisualViewport::ViewportToRootFrame(
@@ skipping 162 matching lines @@
   } else if (graphics_layer == root_transform_layer_.get()) {
     name = "Root Transform Layer";
   } else {
     NOTREACHED();
   }
 
   return name;
 }
 
 }  // namespace blink