Remove GraphicsLayer::didScroll and directly call ScrollableArea::didScroll

ui/views/controls/scroll_view.h

 // Copyright (c) 2012 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 UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 #define UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 131 matching lines @@
 
   // Helpers to get and set the current scroll offset (either from the ui::Layer
   // or from the |contents_| origin offset).
   gfx::ScrollOffset CurrentOffset() const;
   void ScrollToOffset(const gfx::ScrollOffset& offset);
 
   // Whether the ScrollView scrolls using ui::Layer APIs.
   bool ScrollsWithLayers() const;
 
   // Callback entrypoint when hosted Layers are scrolled by the Compositor.
-  void OnLayerScrolled();
+  void OnLayerScrolled(const gfx::ScrollOffset& offset);
 
   // Horizontally scrolls the header (if any) to match the contents.
   void ScrollHeader();
 
   // The current contents and its viewport. |contents_| is contained in
   // |contents_viewport_|.
   View* contents_;
   View* contents_viewport_;
 
   // The current header and its viewport. |header_| is contained in
@@ skipping 95 matching lines @@
  private:
   int top_margin_;
   int row_height_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_