Add/improve tracing in navigation.

content/browser/loader/cross_site_resource_handler.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/browser/loader/cross_site_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 275 matching lines @@
 
   // Defer to tell RDH not to notify the world or clean up the pending request.
   // We will do so in ResumeResponse.
   *defer = true;
   OnDidDefer();
 }
 
 // We can now send the response to the new renderer, which will cause
 // WebContentsImpl to swap in the new renderer and destroy the old one.
 void CrossSiteResourceHandler::ResumeResponse() {
+  TRACE_EVENT_ASYNC_END0(
+      "navigation", "CrossSiteResourceHandler transition", this);
   DCHECK(request());
   in_cross_site_transition_ = false;
   ResourceRequestInfoImpl* info = GetRequestInfo();
 
   if (has_started_response_) {
     // Send OnResponseStarted to the new renderer.
     DCHECK(response_.get());
     bool defer = false;
     if (!next_handler_->OnResponseStarted(response_.get(), &defer)) {
       controller()->Cancel();
@@ skipping 21 matching lines @@
 
 // static
 void CrossSiteResourceHandler::SetLeakRequestsForTesting(
     bool leak_requests_for_testing) {
   leak_requests_for_testing_ = leak_requests_for_testing;
 }
 
 // Prepare to transfer the response to a new RenderFrameHost.
 void CrossSiteResourceHandler::StartCrossSiteTransition(
     ResourceResponse* response) {
+  TRACE_EVENT_ASYNC_BEGIN0(
+      "navigation", "CrossSiteResourceHandler transition", this);
   in_cross_site_transition_ = true;
   response_ = response;
 
   // Store this handler on the ExtraRequestInfo, so that RDH can call our
   // ResumeResponse method when we are ready to resume.
   ResourceRequestInfoImpl* info = GetRequestInfo();
   info->set_cross_site_handler(this);
 
   GlobalRequestID global_id(info->GetChildID(), info->GetRequestID());
 
@@ skipping 65 matching lines @@
     controller()->Resume();
   }
 }
 
 void CrossSiteResourceHandler::OnDidDefer() {
   did_defer_ = true;
   request()->LogBlockedBy("CrossSiteResourceHandler");
 }
 
 }  // namespace content