Makes bindings work with nested message loops

mojo/public/cpp/bindings/message.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 142 matching lines @@
   //
   // NOTE: Upon returning true, AcceptWithResponder assumes ownership of
   // |responder| and will delete it after calling |responder->Accept| or upon
   // its own destruction.
   //
   virtual bool AcceptWithResponder(Message* message,
                                    MessageReceiverWithStatus* responder)
       MOJO_WARN_UNUSED_RESULT = 0;
 };
 
-// Read a single message from the pipe and dispatch to the given receiver.  The
-// receiver may be null, in which case the message is simply discarded.
-// Returns MOJO_RESULT_SHOULD_WAIT if the caller should wait on the handle to
-// become readable. Returns MOJO_RESULT_OK if a message was dispatched and
-// otherwise returns an error code if something went wrong.
+// Read a single message from the pipe. The caller should have created the
+// Message, but not called Initialize(). Returns MOJO_RESULT_SHOULD_WAIT if
+// the caller should wait on the handle to become readable. Returns
+// MOJO_RESULT_OK if the message was read successfully and should be
+// dispatched, otherwise returns an error code if something went wrong.
 //
 // NOTE: The message hasn't been validated and may be malformed!
-MojoResult ReadAndDispatchMessage(MessagePipeHandle handle,
-                                  MessageReceiver* receiver,
-                                  bool* receiver_result);
+MojoResult ReadMessage(MessagePipeHandle handle, Message* message);
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_