Pepper: Move more UMA stuff out of trusted plugin.

ppapi/api/private/ppb_nacl_private.idl

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* This file contains NaCl private interfaces. This interface is not versioned
  * and is for internal Chrome use. It may change without notice. */
 
 label Chrome {
   M25 = 1.0
@@ skipping 417 matching lines @@
                     [out] PP_NaClFileInfo file_info,
                     [in] PP_CompletionCallback callback);
 
   /* Reports the status of sel_ldr for UMA reporting.
    * |max_status| has to be provided because the implementation of this
    * interface can't access the NaClErrorCode enum.
    */
   void ReportSelLdrStatus([in] PP_Instance instance,
                           [in] int32_t load_status,
                           [in] int32_t max_status);
+
+  /* Logs time taken by an operation to UMA histograms.
+   * This function is safe to call off the main thread.

[dmichael (off chromium), 2014/06/13 21:10:35]

"off the main thread"->"on any thread"
?
Might be less ambiguous.

+   */
+  void LogTranslateTime([in] str_t histogram_name,
+                        [in] int64_t time_us);
 };