Pepper: Move DoPostMessage out of trusted plugin.

ppapi/c/private/ppb_nacl_private.h

Index: ppapi/c/private/ppb_nacl_private.h
diff --git a/ppapi/c/private/ppb_nacl_private.h b/ppapi/c/private/ppb_nacl_private.h
index 1bfe9f9106ec1c2b8cc1aeede908637abad5cd92..268e8fd79c703136c02d8dbec293c3d408553abf 100644
--- a/ppapi/c/private/ppb_nacl_private.h
+++ b/ppapi/c/private/ppb_nacl_private.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From private/ppb_nacl_private.idl modified Mon May  5 13:49:42 2014. */
+/* From private/ppb_nacl_private.idl modified Tue May  6 13:41:11 2014. */
 
 #ifndef PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_
@@ -430,6 +430,10 @@ struct PPB_NaCl_Private_1_0 {
                                   const char* filename,
                                   struct PP_Var* llc_tool_name,
                                   struct PP_Var* ld_tool_name);
+  /* Posts a message to the JavaScript object for the given instance.
+   * This method may be called on any thread.
+   */
+  void (*PostMessageToJavaScript)(PP_Instance instance, const char* message);
 };
 
 typedef struct PPB_NaCl_Private_1_0 PPB_NaCl_Private;