Add latency measurement system

webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc

Index: webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc
diff --git a/webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc b/webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc
index 62838a00f78c1e9367fd52cc80e76fe753600c60..154988967c2328e40031588d6c9140f4ea536b44 100644
--- a/webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc
+++ b/webkit/compositor_bindings/web_to_ccinput_handler_adapter.cc
@@ -47,9 +47,9 @@ public:
         return static_cast<WebInputHandlerClient::ScrollStatus>(m_client->scrollBegin(point, static_cast<cc::InputHandlerClient::ScrollInputType>(type)));
     }
 
-    virtual bool scrollByIfPossible(WebPoint point, WebSize offset) OVERRIDE
+    virtual bool scrollByIfPossible(int64 inputNumber, WebPoint point, WebSize offset) OVERRIDE
     {
-      return m_client->scrollBy(point, offset);
+      return m_client->scrollBy(inputNumber, point, offset);
     }
 
     virtual void scrollEnd() OVERRIDE