Adding more detail to MessageQueue::Dispatch logging.

webrtc/base/thread.h

Index: webrtc/base/thread.h
diff --git a/webrtc/base/thread.h b/webrtc/base/thread.h
index 1a0c447264e4284e426b80e9cfd38a3a99503cba..45531e8bb83064dc1b9ddf8fe4913498064aa2d7 100644
--- a/webrtc/base/thread.h
+++ b/webrtc/base/thread.h
@@ -151,7 +151,8 @@ class Thread : public MessageQueue {
   // ProcessMessages occasionally.
   virtual void Run();
 
-  virtual void Send(MessageHandler* phandler,
+  virtual void Send(const Location& posted_from,
+                    MessageHandler* phandler,
                     uint32_t id = 0,
                     MessageData* pdata = NULL);
 
@@ -159,14 +160,14 @@ class Thread : public MessageQueue {
   // provide the |ReturnT| template argument, which cannot (easily) be deduced.
   // Uses Send() internally, which blocks the current thread until execution
   // is complete.
-  // Ex: bool result = thread.Invoke<bool>(&MyFunctionReturningBool);
+  // Ex: bool result = thread.Invoke<bool>(FROM_HERE, &MyFunctionReturningBool);
   // NOTE: This function can only be called when synchronous calls are allowed.
   // See ScopedDisallowBlockingCalls for details.
   template <class ReturnT, class FunctorT>
-  ReturnT Invoke(const FunctorT& functor) {
+  ReturnT Invoke(const Location& posted_from, const FunctorT& functor) {
     InvokeBegin();
     FunctorMessageHandler<ReturnT, FunctorT> handler(functor);
-    Send(&handler);
+    Send(posted_from, &handler);
     InvokeEnd();
     return handler.result();
   }