ChannelMojo should use PID from the bootstrap Channel.

ipc/mojo/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_MOJO_IPC_MOJO_BOOTSTRAP_H_
 #define IPC_MOJO_IPC_MOJO_BOOTSTRAP_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/process/process_handle.h"
 #include "ipc/ipc_channel.h"
@@ skipping 28 matching lines @@
   static scoped_ptr<MojoBootstrap> Create(ChannelHandle handle,
                                           Channel::Mode mode,
                                           Delegate* delegate);
 
   MojoBootstrap();
   ~MojoBootstrap() override;
 
   // Start the handshake over the underlying platform channel.
   bool Connect();
 
+  // GetSelfPID returns the PID associated with |channel_|.
+  base::ProcessId GetSelfPID() const;
+
   // Each client should call this once the process handle becomes known.
   virtual void OnClientLaunched(base::ProcessHandle process) = 0;
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
   int GetClientFileDescriptor() const;
   base::ScopedFD TakeClientFileDescriptor();
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
  protected:
   // On MojoServerBootstrap: INITIALIZED -> WAITING_ACK -> READY
@@ skipping 19 matching lines @@
   scoped_ptr<Channel> channel_;
   Delegate* delegate_;
   State state_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoBootstrap);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_MOJO_IPC_MOJO_BOOTSTRAP_H_