Add instrumentation to the MessagePumpMac family of classes.

base/message_loop/message_pump.h

Index: base/message_loop/message_pump.h
diff --git a/base/message_loop/message_pump.h b/base/message_loop/message_pump.h
index 0ebba3a3e60ccfd07abb2808e2632a254a76747c..6af4a237819c9ef8aff7b8baff88563f362cd7c5 100644
--- a/base/message_loop/message_pump.h
+++ b/base/message_loop/message_pump.h
@@ -6,10 +6,12 @@
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_H_
 
 #include "base/base_export.h"
+#include "base/basictypes.h"
 #include "base/threading/non_thread_safe.h"
 
 namespace base {
 
+class TimeDelta;
 class TimeTicks;
 
 class BASE_EXPORT MessagePump : public NonThreadSafe {
@@ -39,6 +41,12 @@ class BASE_EXPORT MessagePump : public NonThreadSafe {
     // Called from within Run just before the message pump goes to sleep.
     // Returns true to indicate that idle work was done.
     virtual bool DoIdleWork() = 0;
+
+    // Via the two optional out pointers, returns the length of the Delegate's
+    // work queue and the length of time that the first item in the queue has
+    // been waiting to run.
+    virtual void GetQueueingInformation(size_t* queue_count,
+                                        TimeDelta* queueing_delay) {}
   };
 
   MessagePump();