Mojo: Add a "GetType()" to Dispatchers.

mojo/system/message_pipe_dispatcher.h

 // Copyright 2013 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_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_
 #define MOJO_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "mojo/system/dispatcher.h"
 #include "mojo/system/system_impl_export.h"
 
 namespace mojo {
 namespace system {
 
 class MessagePipe;
 
 // This is the |Dispatcher| implementation for message pipes (created by the
 // Mojo primitive |MojoCreateMessagePipe()|). This class is thread-safe.
 class MOJO_SYSTEM_IMPL_EXPORT MessagePipeDispatcher : public Dispatcher {
  public:
   MessagePipeDispatcher();
 
   // Must be called before any other methods. (This method is not thread-safe.)
   void Init(scoped_refptr<MessagePipe> message_pipe, unsigned port);
 
+  virtual Type GetType() OVERRIDE;
+
  private:
   friend class base::RefCountedThreadSafe<MessagePipeDispatcher>;
   virtual ~MessagePipeDispatcher();
 
   // |Dispatcher| implementation/overrides:
   virtual void CancelAllWaitersNoLock() OVERRIDE;
   virtual MojoResult CloseImplNoLock() OVERRIDE;
   virtual MojoResult WriteMessageImplNoLock(
       const void* bytes, uint32_t num_bytes,
       const std::vector<Dispatcher*>* dispatchers,
@@ skipping 14 matching lines @@
   scoped_refptr<MessagePipe> message_pipe_;  // This will be null if closed.
   unsigned port_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePipeDispatcher);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_MESSAGE_PIPE_DISPATCHER_H_