Profiler-instrumentation of the startup time

content/browser/browser_main_runner.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/public/browser/browser_main_runner.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/trace_event/trace_event.h"
+#include "base/tracked_objects.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/browser_shutdown_profile_dumper.h"
 #include "content/browser/notification_service_impl.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "ui/base/ime/input_method_initializer.h"
 
 #if defined(OS_WIN)
 #include "base/win/win_util.h"
 #include "base/win/windows_version.h"
@@ skipping 95 matching lines @@
  public:
   BrowserMainRunnerImpl()
       : initialization_started_(false), is_shutdown_(false) {}
 
   ~BrowserMainRunnerImpl() override {
     if (initialization_started_ && !is_shutdown_)
       Shutdown();
   }
 
   int Initialize(const MainFunctionParams& parameters) override {
+    // TODO(vadimt): Remove all tracked_objects references below once
+    // crbug.com/453640 is fixed.
+    tracked_objects::ThreadData::Initialize();
+
+    tracked_objects::ScopedTracker tracking_profile(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION("BrowserMainRunnerImpl::Initialize"));
+
     TRACE_EVENT0("startup", "BrowserMainRunnerImpl::Initialize");
     // On Android we normally initialize the browser in a series of UI thread
     // tasks. While this is happening a second request can come from the OS or
     // another application to start the browser. If this happens then we must
     // not run these parts of initialization twice.
     if (!initialization_started_) {
       initialization_started_ = true;
 
 #if !defined(OS_IOS)
       if (parameters.command_line.HasSwitch(switches::kWaitForDebugger))
@@ skipping 138 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainRunnerImpl);
 };
 
 // static
 BrowserMainRunner* BrowserMainRunner::Create() {
   return new BrowserMainRunnerImpl();
 }
 
 }  // namespace content