Add TRACE_EVENT macros to net.

net/proxy/proxy_resolver_v8_tracing.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 "net/proxy/proxy_resolver_v8_tracing.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/cancellation_flag.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/trace_event/trace_event.h"
 #include "net/base/address_list.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_interfaces.h"
 #include "net/dns/host_resolver.h"
 #include "net/proxy/proxy_info.h"
 #include "net/proxy/proxy_resolver_error_observer.h"
 #include "net/proxy/proxy_resolver_v8.h"
 #include "url/url_canon.h"
 
 // The intent of this class is explained in the design document:
@@ skipping 538 matching lines @@
     return;
   }
 
   if (abandoned_)
     return;
 
   NotifyCaller(result);
 }
 
 int Job::ExecuteProxyResolver() {
+  TRACE_EVENT0("v8", "Job::ExecuteProxyResolver");

[mmenke, 2016/04/04 16:45:49]

Is v8 the right label for net code?  Yes, we are just running v8 here, not sure
about tracing names in general.

[ssid, 2016/04/05 00:50:13]

Sorry I missed this one. The name is generally the namespace of the function.
But when it is not strict. Changed it to net to stick to namespace in this case.

   int result = ERR_UNEXPECTED;  // Initialized to silence warnings.
 
   switch (operation_) {
     case CREATE_V8_RESOLVER: {
       scoped_ptr<ProxyResolverV8> resolver;
       result = ProxyResolverV8::Create(script_data_, this, &resolver);
       if (result == OK)
         *resolver_out_ = std::move(resolver);
       break;
     }
@@ skipping 644 matching lines @@
 
 // static
 scoped_ptr<ProxyResolverV8TracingFactory>
 ProxyResolverV8TracingFactory::Create() {
   return make_scoped_ptr(new ProxyResolverV8TracingFactoryImpl());
 }
 
 const char kHistogramPacResultForStrippedUrl[] = "Net.PacResultForStrippedUrl";
 
 }  // namespace net