Proof of concept for tr1-based Task replacement.

base/message_loop.h

Index: base/message_loop.h
diff --git a/base/message_loop.h b/base/message_loop.h
index a5a94bc0314e8105cccfed852570ed761dc049cd..176916d45fa5cbb39d32f4ae78ac892688f5b279 100644
--- a/base/message_loop.h
+++ b/base/message_loop.h
@@ -15,6 +15,7 @@
 #include "base/observer_list.h"
 #include "base/ref_counted.h"
 #include "base/task.h"
+#include "base/closure.h"
 
 #if defined(OS_WIN)
 // We need this to declare base::MessagePumpWin::Dispatcher, which we should
@@ -127,12 +128,19 @@ class MessageLoop : public base::MessagePump::Delegate {
   // NOTE: These methods may be called on any thread.  The Task will be invoked
   // on the thread that executes MessageLoop::Run().
 
+  void PostClosure(
+      const tracked_objects::Location& from_here, base::Closure closure);
+
   void PostTask(
       const tracked_objects::Location& from_here, Task* task);
 
   void PostDelayedTask(
       const tracked_objects::Location& from_here, Task* task, int64 delay_ms);
 
+  void PostDelayedClosure(
+      const tracked_objects::Location& from_here, base::Closure closure,
+      int64 delay_ms);
+
   void PostNonNestableTask(
       const tracked_objects::Location& from_here, Task* task);