Mojo Channel: Fix deferred proxy dispatch; support paused channels

ipc/ipc_mojo_bootstrap.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 IPC_IPC_MOJO_BOOTSTRAP_H_
 #define IPC_IPC_MOJO_BOOTSTRAP_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 34 matching lines @@
   // mode as specified by |mode|. The result is passed to |delegate|.
   static std::unique_ptr<MojoBootstrap> Create(
       mojo::ScopedMessagePipeHandle handle,
       Channel::Mode mode,
       Delegate* delegate,
       const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner);
 
   // Start the handshake over the underlying message pipe.
   virtual void Connect() = 0;
 
+  // Stop queuing new messages and start transmitting them instead.
+  virtual void Start() = 0;
+
+  // Flush outgoing messages which were queued before Start().
+  virtual void Flush() = 0;
+
   virtual mojo::AssociatedGroup* GetAssociatedGroup() = 0;
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MOJO_BOOTSTRAP_H_