Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/ppb_messaging.srpc

+# Copyright (c) 2011 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# RPC methods used to implement PPB_Messaging interface.
+# See ppapi/c/ppb_messaging.h for interface details.
+{
+ 'name': 'PpbMessagingRpc',
+ 'rpcs': [
+          {'name': 'PPB_Messaging_PostMessage',
+           'inputs': [['instance', 'PP_Instance'],  # PP_Instance
+                      ['message', 'char[]'],  # PP_Var
+                     ],
+           'outputs': []
+          },
+         ]
+}