Introduce ChannelMojo

ipc/ipc_channel.h

Index: ipc/ipc_channel.h
diff --git a/ipc/ipc_channel.h b/ipc/ipc_channel.h
index bca3ea066c35f3477b37886fe16adf9e4ac5efbe..8b7b5443ddfc336b7e6c276e77d091572a5ce2c9 100644
--- a/ipc/ipc_channel.h
+++ b/ipc/ipc_channel.h
@@ -170,6 +170,12 @@ class IPC_EXPORT Channel : public Sender {
   // listener.
   virtual base::ProcessId GetPeerPID() const = 0;
 
+  // Get its own process id. This value is told to the peer.
+  virtual base::ProcessId GetSelfPID() const = 0;
+
+  // Get connected ChannelHandle which the channel owns.
+  virtual ChannelHandle GetPipeHandle() const = 0;
+
   // Send a message over the Channel to the listener on the other end.
   //
   // |message| must be allocated using operator new.  This object will be