Add latency measurement system

content/renderer/gpu/compositor_thread.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 "content/renderer/gpu/compositor_thread.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "content/renderer/gpu/input_event_filter.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebActiveWheelFlingParameters.h"
@@ skipping 134 matching lines @@
   DCHECK_EQ(MessageLoop::current(), thread_.message_loop());
 
   TRACE_EVENT0("CompositorThread::RemoveInputHandler", "RemovingRoute");
 
   filter_->RemoveRoute(routing_id);
   input_handlers_.erase(routing_id);
 }
 
 void CompositorThread::HandleInputEvent(
     int routing_id,
+    int64 input_number,
     const WebInputEvent* input_event) {
   DCHECK_EQ(MessageLoop::current(), thread_.message_loop());
 
   InputHandlerMap::iterator it = input_handlers_.find(routing_id);
   if (it == input_handlers_.end()) {
     TRACE_EVENT0("CompositorThread::HandleInputEvent", "NoInputHandlerFound");
     // Oops, we no longer have an interested input handler..
     filter_->DidNotHandleInputEvent(true);
     return;
   }
 
-  it->second->input_handler()->handleInputEvent(*input_event);
+  it->second->input_handler()->handleInputEvent(*input_event, input_number);
 }
 
 }  // namespace content