Pepper: Move DoPostMessage out of trusted plugin.

ppapi/api/private/ppb_nacl_private.idl

Index: ppapi/api/private/ppb_nacl_private.idl
diff --git a/ppapi/api/private/ppb_nacl_private.idl b/ppapi/api/private/ppb_nacl_private.idl
index fee706738fb125e090245e2fb5b2881a72b5ad75..0160e5240816954cdb8f1ea1b307a616eda24b5f 100644
--- a/ppapi/api/private/ppb_nacl_private.idl
+++ b/ppapi/api/private/ppb_nacl_private.idl
@@ -440,4 +440,10 @@ interface PPB_NaCl_Private {
                                [in] str_t filename,
                                [out] PP_Var llc_tool_name,
                                [out] 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([in] PP_Instance instance,
+                               [in] str_t message);

[bbudge, 2014/05/06 20:48:20]

Are you using str_t here to make usage simpler? In the implementation you have
to convert this back into a PP_Var to send over the MessageChannel. I guess this
is the logical choice unless other call sites would already have constructed a
PP_Var. I only see a single call, in service_runtime.cc.

 };