Added command line switches and UI (controlled via a build option)

chrome/common/profiling.h

+// Copyright (c) 2006-2008 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_COMMON_PROFILING_H_
+#define CHROME_COMMON_PROFILING_H_
+#pragma once
+
+#include "build/build_config.h"
+
+#include "base/basictypes.h"
+#include "base/debug/profiler.h"
+
+// The Profiling class manages the interaction with a sampling based profiler.
+// Its function is controlled by the kProfilingAtStart, kProfilingFile, and
+// kProfilingFlush command line values.
+// All of the API should only be called from the main thread of the process.
+class Profiling {
+ public:
+  // Called early in a process' life to allow profiling of startup time.
+  // the presence of kProfilingAtStart is checked.
+  static void ProcessStarted();
+
+  // Start profiling.
+  static void Start();
+
+  // Stop profiling and write out profiling file.
+  static void Stop();
+
+  // Returns true if the process is being profiled.
+  static bool BeingProfiled();
+
+  // Called when the main message loop is started, so that automatic flushing
+  // of the profile data file can be done.
+  static void MainMessageLoopStarted();
+
+  // Toggle profiling on/off.
+  static void Toggle();
+
+ private:
+  // Do not instantiate this class.
+  Profiling();
+
+  DISALLOW_COPY_AND_ASSIGN(Profiling);
+};
+
+#endif  // CHROME_COMMON_PROFILING_H_
+