Delegate root layer scroll offset to android_webview.

content/public/renderer/android/synchronous_compositor_client.h

Index: content/public/renderer/android/synchronous_compositor_client.h
diff --git a/content/public/renderer/android/synchronous_compositor_client.h b/content/public/renderer/android/synchronous_compositor_client.h
index 34b4d1b340c69e7cc8cb345152d147c4c1b35841..d1320c590fb5a645ab1e36d3d7484b69485fd91f 100644
--- a/content/public/renderer/android/synchronous_compositor_client.h
+++ b/content/public/renderer/android/synchronous_compositor_client.h
@@ -5,6 +5,12 @@
 #ifndef CONTENT_PUBLIC_RENDERER_ANDROID_SYNCHRONOUS_COMPOSTIOR_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_ANDROID_SYNCRHONOUS_COMPOSITOR_CLIENT_H_
 
+#include "base/basictypes.h"
+
+namespace gfx {
+class Vector2dF;
+}
+
 namespace content {
 
 class SynchronousCompositor;
@@ -17,7 +23,9 @@ class SynchronousCompositorClient {
   // SynchronousCompositor::SetClient(NULL) to release the back pointer.
   virtual void DidDestroyCompositor(SynchronousCompositor* compositor) = 0;
 
-  // TODO(joth): Add scroll getters and setters.
+  // See LayerScrollOffsetDelegate for details.
+  virtual void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value) = 0;
+  virtual gfx::Vector2dF GetTotalRootLayerScrollOffset() = 0;
 
   // When true, should periodically call
   // SynchronousCompositorOutputSurface::DemandDrawHw. Note that this value
@@ -25,7 +33,11 @@ class SynchronousCompositorClient {
   virtual void SetContinuousInvalidate(bool invalidate) = 0;
 
  protected:
+  SynchronousCompositorClient() {}
   virtual ~SynchronousCompositorClient() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorClient);
 };
 
 }  // namespace content