Add an IPC channel between the NaCl loader process and the renderer.

chrome/nacl/nacl_ipc_adapter.h

Index: chrome/nacl/nacl_ipc_adapter.h
===================================================================
--- chrome/nacl/nacl_ipc_adapter.h	(revision 143037)
+++ chrome/nacl/nacl_ipc_adapter.h	(working copy)
@@ -77,6 +77,10 @@
   // NaClDesc is reference-counted, and a reference is returned.
   NaClDesc* MakeNaClDesc();
 
+#if defined(OS_POSIX)
+  int TakeClientFileDescriptor();
+#endif
+
   // Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;