ChannelMojo should use PID from the bootstrap Channel.

ipc/mojo/ipc_mojo_bootstrap.h

Index: ipc/mojo/ipc_mojo_bootstrap.h
diff --git a/ipc/mojo/ipc_mojo_bootstrap.h b/ipc/mojo/ipc_mojo_bootstrap.h
index eb1a987f84cc962b854d60c1b6bd34ba0f02a787..70b7fe113dc92a0f4c2194a3c6903c97a520663c 100644
--- a/ipc/mojo/ipc_mojo_bootstrap.h
+++ b/ipc/mojo/ipc_mojo_bootstrap.h
@@ -46,6 +46,9 @@ class IPC_MOJO_EXPORT MojoBootstrap : public Listener {
   // Start the handshake over the underlying platform channel.
   bool Connect();
 
+  // Ask its own process ID to |channel_|.

[agl, 2015/02/25 02:45:29]

This is wrong, but I'm not sure what it should be. Perhaps:

// GetSelfPID returns the PID associated with |channel_|.

[Hajime Morrita, 2015/02/25 19:13:06]

Done.

+  base::ProcessId GetSelfPID() const;
+
   // Each client should call this once the process handle becomes known.
   virtual void OnClientLaunched(base::ProcessHandle process) = 0;