Add/improve tracing in navigation.

content/browser/frame_host/navigation_controller_impl.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 "content/browser/frame_host/navigation_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 631 matching lines @@
     PageTransition transition,
     const std::string& extra_headers) {
   LoadURLParams params(url);
   params.referrer = referrer;
   params.transition_type = transition;
   params.extra_headers = extra_headers;
   LoadURLWithParams(params);
 }
 
 void NavigationControllerImpl::LoadURLWithParams(const LoadURLParams& params) {
-  TRACE_EVENT0("browser", "NavigationControllerImpl::LoadURLWithParams");
+  TRACE_EVENT1("browser,navigation",
+               "NavigationControllerImpl::LoadURLWithParams",
+               "url", params.url.possibly_invalid_spec());
   if (HandleDebugURL(params.url, params.transition_type)) {
     // If Telemetry is running, allow the URL load to proceed as if it's
     // unhandled, otherwise Telemetry can't tell if Navigation completed.
     if (!CommandLine::ForCurrentProcess()->HasSwitch(
             cc::switches::kEnableGpuBenchmarking))
       return;
   }
 
   // Any renderer-side debug URLs or javascript: URLs should be ignored if the
   // renderer process is not live, unless it is the initial navigation of the
@@ skipping 1123 matching lines @@
     }
   }
 }
 
 void NavigationControllerImpl::SetGetTimestampCallbackForTest(
     const base::Callback<base::Time()>& get_timestamp_callback) {
   get_timestamp_callback_ = get_timestamp_callback;
 }
 
 }  // namespace content