cc/blimp: Add synchronization for scroll/scale state.

cc/blimp/layer_tree_host_remote.h

Index: cc/blimp/layer_tree_host_remote.h
diff --git a/cc/blimp/layer_tree_host_remote.h b/cc/blimp/layer_tree_host_remote.h
index 347ffb173058a89f781e093f8350d1b0325bfcc1..31397119eb9124807c7bc354b7a1954079636464 100644
--- a/cc/blimp/layer_tree_host_remote.h
+++ b/cc/blimp/layer_tree_host_remote.h
@@ -111,9 +111,8 @@ class CC_EXPORT LayerTreeHostRemote : public LayerTreeHost,
 
   // RemoteCompositorBridgeClient implementation.
   void BeginMainFrame() override;
-  bool ApplyScrollAndScaleUpdateFromClient(
-      const ScrollOffsetMap& client_scroll_map,
-      float client_page_scale) override;
+  void ApplyStateUpdateFromClient(
+      const proto::ClientStateUpdate& client_state_update) override;
 
  private:
   enum class FramePipelineStage { NONE, ANIMATE, UPDATE_LAYERS, COMMIT };