Delegate root layer scroll offset to android_webview.

content/browser/android/in_process/synchronous_compositor_impl.h

Index: content/browser/android/in_process/synchronous_compositor_impl.h
diff --git a/content/browser/android/in_process/synchronous_compositor_impl.h b/content/browser/android/in_process/synchronous_compositor_impl.h
index 3659ca01d28148cbd7a0e190beac55ab88441362..8b167205005b5c5e5584771115a187612dbf890e 100644
--- a/content/browser/android/in_process/synchronous_compositor_impl.h
+++ b/content/browser/android/in_process/synchronous_compositor_impl.h
@@ -8,11 +8,13 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "cc/input/layer_scroll_offset_delegate.h"
 #include "content/browser/android/in_process/synchronous_compositor_output_surface.h"
 #include "content/public/browser/android/synchronous_compositor.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace content {
+class InputHandlerManager;
 
 // The purpose of this class is to act as the intermediary between the various
 // components that make up the 'synchronous compositor mode' implementation and
@@ -20,7 +22,8 @@ namespace content {
 // This class is created on the main thread but most of the APIs are called
 // from the Compositor thread.
 class SynchronousCompositorImpl
-    : public SynchronousCompositor,
+    : public cc::LayerScrollOffsetDelegate,
+      public SynchronousCompositor,
       public SynchronousCompositorOutputSurfaceDelegate,
       public WebContentsUserData<SynchronousCompositorImpl> {
  public:
@@ -43,6 +46,10 @@ class SynchronousCompositorImpl
       SynchronousCompositorOutputSurface* output_surface) OVERRIDE;
   virtual void SetContinuousInvalidate(bool enable) OVERRIDE;
 
+  // LayerScrollOffsetDelegate
+  virtual void SetTotalScrollOffset(gfx::Vector2dF new_value) OVERRIDE;
+  virtual gfx::Vector2dF GetTotalScrollOffset() OVERRIDE;
+
  private:
   explicit SynchronousCompositorImpl(WebContents* contents);
   virtual ~SynchronousCompositorImpl();
@@ -56,6 +63,7 @@ class SynchronousCompositorImpl
   SynchronousCompositorClient* compositor_client_;
   SynchronousCompositorOutputSurface* output_surface_;
   WebContents* contents_;
+  InputHandlerManager* input_handler_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorImpl);
 };