Trace PostTasks from post to run

base/message_loop.h

Index: base/message_loop.h
diff --git a/base/message_loop.h b/base/message_loop.h
index 39c646edf9158dfbdd3d40f557ada9f429ff6509..74dfe659cc92292326a7c2e411ab19076b4ea763 100644
--- a/base/message_loop.h
+++ b/base/message_loop.h
@@ -505,7 +505,8 @@ class BASE_EXPORT MessageLoop : public base::MessagePump::Delegate {
   bool os_modal_loop_;
 #endif
 
-  // The next sequence number to use for delayed tasks.
+  // The next sequence number to use for delayed tasks. Updating this counter is
+  // protected by incoming_queue_lock_.
   int next_sequence_num_;

[jar (doing other things), 2012/09/14 02:10:44]

Can we move this to private as well?  I searched, and don't think it is accessed
in any derived class... 

In fact, I *think* the oncoming_queue_lock_ can also move, along with
incoming_queue_.

[jbates, 2012/09/14 18:00:49]

It looks like you're right that many of these members could be private. I filed
https://code.google.com/p/chromium/issues/detail?id=149691 to track this, since
it might make this patch a bit more complicated than necessary.

 
   ObserverList<TaskObserver> task_observers_;