Implement open_resource in non-SFI mode.

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 4bc02e0749e7c182c9b3ed4decbac5cb70359387..a427920ef9b144b99f782e9cd196ef8dee5d8545 100644
--- a/ppapi/api/private/ppb_nacl_private.idl
+++ b/ppapi/api/private/ppb_nacl_private.idl
@@ -146,12 +146,20 @@ struct PP_PNaClOptions {
  * Once false is called, as the service has been destructed, all functions
  * should never be called afterwords.
  */
-interface PP_ManifestService {
+interface PPB_ManifestService {
   /* Called when ManifestService should be destructed. */
   PP_Bool Quit([inout] mem_t user_data);
 
   /* Called when PPAPI initialization in the NaCl plugin is finished. */
   PP_Bool StartupInitializationComplete([inout] mem_t user_data);
+
+  /* Called when irt_open_resource() is invoked in the NaCl plugin.
+   * Upon completion, callback will be invoked. If the OpenResource() returns
+   * PP_FALSE, callback will never be called. */
+  PP_Bool OpenResource([inout] mem_t user_data,
+                       [in] str_t entry_key,
+                       [out] PP_FileHandle file,
+                       [in] PP_CompletionCallback callback);
 };
 
 /* PPB_NaCl_Private */
@@ -184,7 +192,7 @@ interface PPB_NaCl_Private {
                     [in] PP_Bool enable_dyncode_syscalls,
                     [in] PP_Bool enable_exception_handling,
                     [in] PP_Bool enable_crash_throttling,
-                    [in] PP_ManifestService manifest_service_interface,
+                    [in] PPB_ManifestService manifest_service_interface,
                     [inout] mem_t manifest_service_user_data,
                     [out] mem_t imc_handle,
                     [out] PP_Var error_message,