Delegate root layer scroll offset to android_webview.

android_webview/browser/in_process_view_renderer.h

 // Copyright 2013 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 ANDROID_WEBVIEW_BROWSER_IN_PROCESS_IN_PROCESS_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_IN_PROCESS_IN_PROCESS_VIEW_RENDERER_H_
 
 #include "android_webview/browser/browser_view_renderer_impl.h"
 
 #include "base/memory/weak_ptr.h"
@@ skipping 35 matching lines @@
   virtual bool IsAttachedToWindow() OVERRIDE;
   virtual bool IsViewVisible() OVERRIDE;
   virtual gfx::Rect GetScreenRect() OVERRIDE;
 
   // SynchronousCompositorClient overrides
   virtual void DidInitializeCompositor(
       content::SynchronousCompositor* compositor) OVERRIDE;
   virtual void DidDestroyCompositor(
       content::SynchronousCompositor* compositor) OVERRIDE;
   virtual void SetContinuousInvalidate(bool invalidate) OVERRIDE;
+  virtual void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value) OVERRIDE;
+  virtual gfx::Vector2dF GetTotalRootLayerScrollOffset() OVERRIDE;
 
   void WebContentsGone();
 
  private:
   void Invalidate();
   void EnsureContinuousInvalidation();
   bool DrawSWInternal(jobject java_canvas,
                       const gfx::Rect& clip_bounds);
   bool RenderSW(SkCanvas* canvas);
   bool CompositeSW(SkCanvas* canvas);
@@ skipping 18 matching lines @@
   bool hardware_initialized_;
   bool hardware_failed_;
 
   // Used only for detecting Android View System context changes.
   // Not to be used between draw calls.
   EGLContext egl_context_at_init_;
 
   // Last View scroll before hardware rendering is triggered.
   gfx::Point hw_rendering_scroll_;
 
+  gfx::Vector2dF scroll_offset_;
+
   base::WeakPtrFactory<InProcessViewRenderer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_IN_PROCESS_IN_PROCESS_VIEW_RENDERER_H_