Add PlatformFrameView class.

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

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 24 matching lines @@
 #include "core/frame/RootFrameViewport.h"
 #include "core/layout/MapCoordinatesFlags.h"
 #include "core/layout/ScrollAnchor.h"
 #include "core/paint/FirstMeaningfulPaintDetector.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintInvalidationCapableScrollableArea.h"
 #include "core/paint/PaintPhase.h"
 #include "core/paint/ScrollbarManager.h"
 #include "core/plugins/PluginView.h"
 #include "platform/FrameViewBase.h"
+#include "platform/PlatformFrameView.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/animation/CompositorAnimationHost.h"
 #include "platform/animation/CompositorAnimationTimeline.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/graphics/CompositorElementId.h"
 #include "platform/graphics/GraphicsLayerClient.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/Scrollbar.h"
@@ skipping 41 matching lines @@
 class ScrollingCoordinator;
 class TracedValue;
 class TransformState;
 struct AnnotatedRegionValue;
 struct CompositedSelection;
 
 typedef unsigned long long DOMTimeStamp;
 
 class CORE_EXPORT FrameView final
     : public GarbageCollectedFinalized<FrameView>,
+      public PlatformFrameView,
       public FrameViewBase,
       public FrameOrPlugin,
       public PaintInvalidationCapableScrollableArea {
   USING_GARBAGE_COLLECTED_MIXIN(FrameView);
 
   friend class PaintControllerPaintTestBase;
   friend class Internals;
   friend class LayoutPart;  // for invalidateTreeIfNeeded
 
  public:
@@ skipping 1145 matching lines @@
     return;
   visually_non_empty_pixel_count_ += size.Area();
   // Use a threshold value to prevent very small amounts of visible content from
   // triggering didMeaningfulLayout.
   static const unsigned kVisualPixelThreshold = 32 * 32;
   if (visually_non_empty_pixel_count_ > kVisualPixelThreshold)
     SetIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView,
+                  PlatformFrameView,
+                  platform_frame_view,
+                  platform_frame_view->IsFrameView(),
+                  platform_frame_view.IsFrameView());
+DEFINE_TYPE_CASTS(FrameView,
                   FrameViewBase,
                   frameViewBase,
                   frameViewBase->IsFrameView(),
                   frameViewBase.IsFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->IsFrameView(),
                   scrollableArea.IsFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h