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 d38f5c51eaa53629b4220cfad3a02a890289cb0a..36faf5a24916c62935de66aa1ec4eceac3a9dd53 100644
--- a/ppapi/api/private/ppb_nacl_private.idl
+++ b/ppapi/api/private/ppb_nacl_private.idl
@@ -139,6 +139,10 @@ struct PP_PNaClOptions {
   int32_t opt_level;
 };
 
+/* Callback invoked upon completion of PPP_ManifestService::OpenResource(). */
+typedef void PP_OpenResourceCompletionCallback([inout] mem_t user_data,
+                                               [in] PP_FileHandle file_handle);
+
 /* ManifestService to support irt_open_resource() function.
  * All functions of the service should have PP_Bool return value. It represents
  * whether the service is still alive or not. Trivially Quit() should always
@@ -146,12 +150,20 @@ struct PP_PNaClOptions {
  * Once false is called, as the service has been destructed, all functions
  * should never be called afterwords.
  */
-interface PP_ManifestService {
+interface PPP_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 with given callback_user_data
+   * and the result file handle (or PP_kInvalidFileHandle on error). */
+  PP_Bool OpenResource([inout] mem_t user_data,
+                       [in] str_t entry_key,
+                       [in] PP_OpenResourceCompletionCallback callback,
+                       [inout] mem_t callback_user_data);
 };
 
 /* PPB_NaCl_Private */
@@ -184,7 +196,7 @@ 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] PPP_ManifestService manifest_service_interface,
                     [inout] mem_t manifest_service_user_data,
                     [out] mem_t imc_handle,
                     [out] PP_Var error_message,