Notify paint for each frame

third_party/WebKit/Source/core/paint/FramePainter.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 FramePainter_h
 #define FramePainter_h
 
 #include "core/paint/PaintPhase.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class CullRect;
 class FrameView;
 class GraphicsContext;
 class IntRect;
 class Scrollbar;
 
 class FramePainter {
   STACK_ALLOCATED();
   WTF_MAKE_NONCOPYABLE(FramePainter);
 
  public:
-  explicit FramePainter(const FrameView& frame_view)
-      : frame_view_(&frame_view) {}
+  FramePainter(GraphicsContext&, const FrameView&);
+  ~FramePainter();
 
-  void Paint(GraphicsContext&, const GlobalPaintFlags, const CullRect&);
-  void PaintScrollbars(GraphicsContext&, const IntRect&);
-  void PaintContents(GraphicsContext&, const GlobalPaintFlags, const IntRect&);
-  void PaintScrollCorner(GraphicsContext&, const IntRect& corner_rect);
+  void Paint(const GlobalPaintFlags, const CullRect&);
+  void PaintScrollbars(const IntRect&);
+  void PaintContents(const GlobalPaintFlags, const IntRect&);
+  void PaintScrollCorner(const IntRect& corner_rect);
+
+  void NotifyPaint() const;
 
  private:
-  void PaintScrollbar(GraphicsContext&, Scrollbar&, const IntRect&);
+  void PaintScrollbar(Scrollbar&, const IntRect&);
 
-  const FrameView& GetFrameView();
+  const FrameView& GetFrameView() const;
 
+  GraphicsContext& context_;
   Member<const FrameView> frame_view_;
   static bool in_paint_contents_;
 };
 
 }  // namespace blink
 
 #endif  // FramePainter_h