Support tracking of IPC messages as tasks in profiler

base/profiler/scoped_profile.cc

Index: base/profiler/scoped_profile.cc
===================================================================
--- base/profiler/scoped_profile.cc	(revision 0)
+++ base/profiler/scoped_profile.cc	(revision 0)
@@ -0,0 +1,31 @@
+// Copyright (c) 2011 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/profiler/scoped_profile.h"
+
+#include "base/location.h"
+#include "base/tracked_objects.h"
+
+
+namespace tracked_objects {
+
+
+ScopedProfile::ScopedProfile(const Location& location)
+    : birth_(ThreadData::TallyABirthIfActive(location)),
+      start_of_run_(ThreadData::Now()) {
+}
+
+ScopedProfile::~ScopedProfile() {
+  StopClockAndTally();
+}
+
+void ScopedProfile::StopClockAndTally() {
+  if (!birth_)
+    return;
+  ThreadData::TallyRunInAScopedRegionIfTracking(birth_, start_of_run_,
+                                                ThreadData::Now());
+  birth_ = NULL;
+}
+
+}  // namespace tracked_objects