Plumb an overscroll callback form the compositor to the Android UI thread.

content/browser/renderer_host/render_widget_host_view_android.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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
@@ skipping 114 matching lines @@
   virtual void SetScrollOffsetPinning(
       bool is_pinned_to_left, bool is_pinned_to_right) OVERRIDE;
   virtual bool LockMouse() OVERRIDE;
   virtual void UnlockMouse() OVERRIDE;
   virtual void StartContentIntent(const GURL& content_url) OVERRIDE;
   virtual void HasTouchEventHandlers(bool need_touch_events) OVERRIDE;
   virtual void SetCachedBackgroundColor(SkColor color) OVERRIDE;
   virtual void SetCachedPageScaleFactorLimits(float minimum_scale,
                                               float maximum_scale) OVERRIDE;
   virtual void UpdateFrameInfo(const gfx::Vector2d& scroll_offset,
+                               const gfx::Vector2d& unused_scroll_delta,
                                float page_scale_factor,
                                float min_page_scale_factor,
                                float max_page_scale_factor,
                                const gfx::Size& content_size,
                                const gfx::Vector2dF& controls_offset,
                                const gfx::Vector2dF& content_offset) OVERRIDE;
   virtual void ShowDisambiguationPopup(const gfx::Rect& target_rect,
                                        const SkBitmap& zoomed_bitmap) OVERRIDE;
 
   // Non-virtual methods
@@ skipping 54 matching lines @@
 
   // The mailbox name of the previously received frame.
   std::string current_mailbox_name_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_