Add event trace to DispatchEvent on ozone

ui/aura/window_tree_host_ozone.cc

 // Copyright 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/aura/window_tree_host_ozone.h"
 
+#include "base/trace_event/trace_event.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/platform_window/platform_window.h"
 
 namespace aura {
 
 WindowTreeHostOzone::WindowTreeHostOzone(const gfx::Rect& bounds)
     : widget_(gfx::kNullAcceleratedWidget), current_cursor_(ui::kCursorNull) {
   platform_window_ =
       ui::OzonePlatform::GetInstance()->CreatePlatformWindow(this, bounds);
@@ skipping 56 matching lines @@
 
 void WindowTreeHostOzone::OnBoundsChanged(const gfx::Rect& new_bounds) {
   // TOOD(spang): Should we determine which parts changed?
   OnHostResized(new_bounds.size());
   OnHostMoved(new_bounds.origin());
 }
 
 void WindowTreeHostOzone::OnDamageRect(const gfx::Rect& damaged_region) {
 }
 
 void WindowTreeHostOzone::DispatchEvent(ui::Event* event) {

[spang, 2015/03/04 00:14:05]

FYI

ash overrides this function. It will not be called with ash.

+  TRACE_EVENT0("input", "WindowTreeHostOzone::DispatchEvent");
   SendEventToProcessor(event);
 }
 
 void WindowTreeHostOzone::OnCloseRequest() {
   OnHostCloseRequested();
 }
 
 void WindowTreeHostOzone::OnClosed() {
 }
 
@@ skipping 22 matching lines @@
   return new WindowTreeHostOzone(bounds);
 }
 
 // static
 gfx::Size WindowTreeHost::GetNativeScreenSize() {
   NOTIMPLEMENTED();
   return gfx::Size();
 }
 
 }  // namespace aura