Enable startup profiling by Win x64 stack sampling profiler

chrome/browser/chrome_browser_main.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 #define CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
+#include "base/profiler/stack_sampling_profiler.h"
 #include "base/tracked_objects.h"
 #include "chrome/browser/chrome_browser_field_trials.h"
 #include "chrome/browser/chrome_process_singleton.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/process_singleton.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/common/main_function_params.h"
 
 class BrowserProcessImpl;
@@ skipping 81 matching lines @@
   // switches.
   void SetupMetricsAndFieldTrials();
 
   // Starts recording of metrics. This can only be called after we have a file
   // thread.
   void StartMetricsRecording();
 
   // Record time from process startup to present time in an UMA histogram.
   void RecordBrowserStartupTime();
 
-  // Records a time value to an UMA histogram in the context of the
-  // PreReadExperiment field-trial. This also reports to the appropriate
-  // sub-histogram (_PreRead(Enabled|Disabled)).
-  void RecordPreReadExperimentTime(const char* name, base::TimeDelta time);
+  // Create parameters for sampling stacks during startup.
+  static base::StackSamplingProfiler::SamplingParams GetStartupSamplingParams();
 
   // Methods for Main Message Loop -------------------------------------------
 
   int PreCreateThreadsImpl();
   int PreMainMessageLoopRunImpl();
 
   // Members initialized on construction ---------------------------------------
 
   const content::MainFunctionParams parameters_;
   const base::CommandLine& parsed_command_line_;
@@ skipping 15 matching lines @@
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
   // A monitor for attributing power consumption to origins.
   scoped_ptr<ProcessPowerCollector> process_power_collector_;
 #endif
 
   // Vector of additional ChromeBrowserMainExtraParts.
   // Parts are deleted in the inverse order they are added.
   std::vector<ChromeBrowserMainExtraParts*> chrome_extra_parts_;
 
+  // A profiler that periodically samples stack traces. Used to sample startup
+  // behavior.
+  base::StackSamplingProfiler sampling_profiler_;
+
   // Members initialized after / released before main_message_loop_ ------------
 
   scoped_ptr<BrowserProcessImpl> browser_process_;
   scoped_refptr<metrics::TrackingSynchronizer> tracking_synchronizer_;
 #if !defined(OS_ANDROID)
   // Browser creation happens on the Java side in Android.
   scoped_ptr<StartupBrowserCreator> browser_creator_;
 
   // Android doesn't support multiple browser processes, so it doesn't implement
   // ProcessSingleton.
@@ skipping 15 matching lines @@
   PrefService* local_state_;
   base::FilePath user_data_dir_;
 
   // Members needed across shutdown methods.
   bool restart_last_session_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainParts);
 };
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_H_