Delegate root layer scroll offset to android_webview.

android_webview/browser/in_process_renderer/in_process_view_renderer.h

Index: android_webview/browser/in_process_renderer/in_process_view_renderer.h
diff --git a/android_webview/browser/in_process_renderer/in_process_view_renderer.h b/android_webview/browser/in_process_renderer/in_process_view_renderer.h
index 533633925ab3ab2e07051d83da91e2b961f90305..fdc3d34a1f7cb0b358093530e222be7a1fd4b48e 100644
--- a/android_webview/browser/in_process_renderer/in_process_view_renderer.h
+++ b/android_webview/browser/in_process_renderer/in_process_view_renderer.h
@@ -55,6 +55,8 @@ class InProcessViewRenderer : public BrowserViewRenderer,
   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();
 
@@ -92,6 +94,9 @@ class InProcessViewRenderer : public BrowserViewRenderer,
   // Last View scroll before hardware rendering is triggered.
   gfx::Point hw_rendering_scroll_;
 
+  // TODO(mkosiba): Plumb through to Java
+  gfx::Vector2dF root_layer_scroll_offset_;
+
   base::WeakPtrFactory<InProcessViewRenderer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessViewRenderer);