Native Client side changes for debugging support: stdout/err -> postmessage.

src/trusted/desc/nacl_desc_base.c

Index: src/trusted/desc/nacl_desc_base.c
===================================================================
--- src/trusted/desc/nacl_desc_base.c	(revision 7373)
+++ src/trusted/desc/nacl_desc_base.c	(working copy)
@@ -131,6 +131,7 @@
   NaClDescInternalizeNotImplemented,  /* imc socket */
   NaClDescQuotaInternalize,           /* quota wrapper */
   NaClDescRngInternalize,             /* device: rng */
+  NaClDescInternalizeNotImplemented   /* device: postmessage */
 };
 
 char const *NaClDescTypeString(enum NaClDescTypeTag type_tag) {
@@ -154,6 +155,7 @@
     MAP(NACL_DESC_IMC_SOCKET);
     MAP(NACL_DESC_QUOTA);
     MAP(NACL_DESC_DEVICE_RNG);
+    MAP(NACL_DESC_DEVICE_POSTMESSAGE);
   }
   return "BAD TYPE TAG";
 }