Update from https://crrev.com/302630

base/profiler/scoped_tracker.cc

 // Copyright 2014 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_tracker.h"
 
+#include "base/bind.h"
+
 namespace tracked_objects {
 
 namespace {
 
 ScopedProfile::Mode g_scoped_profile_mode = ScopedProfile::DISABLED;
 
+// Executes |callback|, augmenting it with provided |location|.
+void ExecuteAndTrackCallback(const Location& location,
+                             const base::Closure& callback) {
+  ScopedProfile tracking_profile(location);
+  callback.Run();
+}
+
 }  // namespace
 
 // static
 void ScopedTracker::Enable() {
   g_scoped_profile_mode = ScopedProfile::ENABLED;
 }
 
+// static
+base::Closure ScopedTracker::TrackCallback(const Location& location,
+                                           const base::Closure& callback) {
+  if (g_scoped_profile_mode != ScopedProfile::ENABLED)
+    return callback;
+
+  return base::Bind(ExecuteAndTrackCallback, location, callback);
+}
+
 ScopedTracker::ScopedTracker(const Location& location)
     : scoped_profile_(location, g_scoped_profile_mode) {
 }
 
 }  // namespace tracked_objects