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.cdddfd

[evanm, 2011/02/01 19:39:59]

typos in here

[DaveMoore, 2011/02/01 21:33:04]

Done.

+class Profiling {
+ public:
+  // Called early in a process' life to allow profiling of the startup process.

[evanm, 2011/02/01 19:39:59]

Maybe mention that this examines command-line flags to judge whether to run. 
"StartAtStart" isn't very descriptive and the comment doesn't fill in what it
does -- a name like "StartAtStartupIfNecessary" or something would help (that
name isn't so good, but hopefully you get my idea)

[DaveMoore, 2011/02/01 21:33:04]

Changed method name to ProcessStarted() to match MainMessageLoopStarted().
On 2011/02/01 19:39:59, evanm wrote:
Done.

+  static void StartAtStart();
+
+  // 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_
+