Add latency measurement system

ui/aura/root_window.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 468 matching lines @@
     ScheduleDraw();
   }
 }
 
 void RootWindow::OnCompositingAborted(ui::Compositor*) {
 }
 
 void RootWindow::OnCompositingLockStateChanged(ui::Compositor*) {
 }
 
+void RootWindow::OnReceivedLatencyInfo(ui::Compositor*,
+    const WebKit::WebLatencyInfoImpl&) {
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindow, ui::LayerDelegate implementation:
 
 void RootWindow::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   const bool cursor_is_in_bounds =
       GetBoundsInScreen().Contains(Env::GetInstance()->last_mouse_location());
   bool cursor_visible = false;
   client::CursorClient* cursor_client = client::GetCursorClient(this);
   if (cursor_is_in_bounds && cursor_client) {
@@ skipping 489 matching lines @@
   ui::MouseEvent event(ui::ET_MOUSE_MOVED,
                        orig_mouse_location,
                        orig_mouse_location,
                        ui::EF_IS_SYNTHESIZED);
   event.set_system_location(Env::GetInstance()->last_mouse_location());
   OnHostMouseEvent(&event);
 #endif
 }
 
 }  // namespace aura