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

base/debug/profiler.cc

+// Copyright (c) 2010 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 "base/debug/profiler.h"
+
+#include <string>
+
+#include "base/process_util.h"
+#include "base/string_util.h"
+
+#if defined(ENABLE_PROFILING) && !defined(NO_TCMALLOC)
+#include "third_party/tcmalloc/chromium/src/google/profiler.h"
+#endif
+
+namespace base {
+namespace debug {
+
+#if defined(ENABLE_PROFILING) && !defined(NO_TCMALLOC)
+
+static int profile_count = 0;
+
+void StartProfiling(const std::string& name) {
+  ++profile_count;
+  std::string full_name(name);
+  std::string pid = StringPrintf("%d", GetCurrentProcId());
+  std::string count = StringPrintf("%d", profile_count);
+  ReplaceSubstringsAfterOffset(&full_name, 0, "{pid}", pid.c_str());
+  ReplaceSubstringsAfterOffset(&full_name, 0, "{count}", count);

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

The last argument here is a string, right?  So the .c_str() above isn't
necesssary (?)

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

ProfilerStart in tcmalloc takes a const char*
On 2011/02/01 19:39:59, evanm wrote:

[evanm, 2011/02/01 21:41:24]

No, above this line.  You have two calls in a row to the same function with
different argument types

+  ProfilerStart(full_name.c_str());
+}
+
+void StopProfiling() {
+  ProfilerFlush();
+  ProfilerStop();
+}
+
+void FlushProfiling() {
+    ProfilerFlush();

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

2spc 

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

Done.

+}
+
+bool BeingProfiled() {
+  return ProfilingIsEnabledForAllThreads();
+}
+
+#else
+
+void StartProfiling(const std::string& name) {
+}
+
+void StopProfiling() {
+}
+
+void FlushProfiling() {
+}
+
+bool BeingProfiled() {
+  return false;
+}
+
+#endif
+
+}  // namespace debug
+}  // namespace base
+