ozone: Add some tracing for platform & evdev

ui/events/ozone/event_converter_ozone.cc

 // Copyright (c) 2013 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/events/ozone/event_converter_ozone.h"
 
 #include "base/bind.h"
+#include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_pump_ozone.h"
 #include "ui/events/event.h"
 
 namespace {
 
 void DispatchEventHelper(scoped_ptr<ui::Event> key) {
+  TRACE_EVENT1("ozone", "DispatchEventHelper", "type", key->type());
   base::MessagePumpOzone::Current()->Dispatch(key.get());
 }
 
 }  // namespace
 
 namespace ui {
 
 EventConverterOzone::EventConverterOzone() {
 }
 
 EventConverterOzone::~EventConverterOzone() {
 }
 
 void EventConverterOzone::DispatchEvent(scoped_ptr<ui::Event> event) {
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&DispatchEventHelper, base::Passed(&event)));
 }
 
 }  // namespace ui