Add MessageLoopProxy::current

base/message_loop.h

Index: base/message_loop.h
diff --git a/base/message_loop.h b/base/message_loop.h
index 9355ec957b0d856fb344202ec20401f5a0b3ecfb..976c5cebca1c4aa153f0d223e121abc8ad2ed3fa 100644
--- a/base/message_loop.h
+++ b/base/message_loop.h
@@ -13,6 +13,7 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
+#include "base/message_loop_proxy.h"
 #include "base/message_pump.h"
 #include "base/observer_list.h"
 #include "base/synchronization/lock.h"
@@ -271,6 +272,11 @@ class BASE_EXPORT MessageLoop : public base::MessagePump::Delegate {
   }
   const std::string& thread_name() const { return thread_name_; }
 
+  // Gets the message loop proxy associated with this message loop proxy
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy() {
+    return message_loop_proxy_.get();
+  }
+
   // Enables or disables the recursive task processing. This happens in the case
   // of recursive message loops. Some unwanted message loop may occurs when
   // using common controls or printer functions. By default, recursive task
@@ -573,6 +579,9 @@ class BASE_EXPORT MessageLoop : public base::MessagePump::Delegate {
 
   ObserverList<TaskObserver> task_observers_;
 
+  // The message loop proxy associated with this message loop, if one exists.
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(MessageLoop);
 };