mandoline: Start adding trace events for mandoline stuff.

components/web_view/frame.cc

 // Copyright 2015 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 "components/web_view/frame.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/stl_util.h"
+#include "base/trace_event/trace_event.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_property.h"
 #include "components/web_view/frame_tree.h"
 #include "components/web_view/frame_tree_delegate.h"
 #include "components/web_view/frame_user_data.h"
 #include "components/web_view/frame_utils.h"
 #include "mojo/application/public/interfaces/shell.mojom.h"
 #include "mojo/common/url_type_converters.h"
 #include "url/gurl.h"
 
@@ skipping 346 matching lines @@
                                        requested_url, navigation_start_time));
 }
 
 void Frame::OnCanNavigateFrame(
     const GURL& url,
     base::TimeTicks navigation_start_time,
     uint32_t app_id,
     mojom::FrameClient* frame_client,
     scoped_ptr<FrameUserData> user_data,
     mus::mojom::WindowTreeClientPtr window_tree_client) {
+  TRACE_EVENT1("web_view", "Frame::OnCanNavigateFrame",
+               "url", url.possibly_invalid_spec());
+
   DVLOG(2) << "Frame::OnCanNavigateFrame id=" << id_
            << " equal=" << (AreAppIdsEqual(app_id, app_id_) ? "true" : "false");
   if (AreAppIdsEqual(app_id, app_id_)) {
     // The app currently rendering the frame will continue rendering it. In this
     // case we do not use the WindowTreeClient (because the app has a Window
     // already
     // and ends up reusing it).
     DCHECK(!window_tree_client.get());
     ChangeClient(frame_client, user_data.Pass(), window_tree_client.Pass(),
                  app_id, navigation_start_time);
@@ skipping 204 matching lines @@
                                               final_update);
 }
 
 void Frame::OnFindInPageSelectionUpdated(int32_t request_id,
                                          int32_t active_match_ordinal) {
   tree_->delegate_->OnFindInPageSelectionUpdated(request_id, this,
                                                  active_match_ordinal);
 }
 
 }  // namespace web_view