Update from https://crrev.com/302630

base/profiler/scoped_tracker.cc

Index: base/profiler/scoped_tracker.cc
diff --git a/base/profiler/scoped_tracker.cc b/base/profiler/scoped_tracker.cc
index 5cd0bcae34984d1d99017ccb699d7dbe48409439..1d4f0bfcafd33bf9e3af19644655bded3ad2fef4 100644
--- a/base/profiler/scoped_tracker.cc
+++ b/base/profiler/scoped_tracker.cc
@@ -4,12 +4,21 @@
 
 #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
@@ -17,6 +26,15 @@ 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) {
 }