Support Closure in ALL the loops!

base/tracked_objects.h

Index: base/tracked_objects.h
diff --git a/base/tracked_objects.h b/base/tracked_objects.h
index 5954f16eebd9d3217a669f14ee946a27a8d3f0e2..fdee1b08ff29830f48ed69a0f4dd828290a5ce6a 100644
--- a/base/tracked_objects.h
+++ b/base/tracked_objects.h
@@ -493,9 +493,17 @@ class BASE_API ThreadData {
   // In this thread's data, record a new birth.
   Births* TallyABirth(const Location& location);
 
+
   // Find a place to record a death on this thread.
   void TallyADeath(const Births& lifetimes, const base::TimeDelta& duration);
 
+  // Helper methods to only tally if the current thread has tracking active.
+  //
+  // TallyABirthIfActive will returns NULL if the birth cannot be tallied.
+  static Births* TallyABirthIfActive(const Location& location);
+  static void TallyADeathIfActive(const Births* lifetimes,
+                                  const base::TimeDelta& duration);
+
   // (Thread safe) Get start of list of instances.
   static ThreadData* first();
   // Iterate through the null terminated list of instances.