Plugin Power Saver: Make PPS work well with prerendered pages.

ppapi/api/private/ppb_testing_private.idl

 /* Copyright 2013 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 interface functions used for unit testing. Do not use in
  * production code. They are not guaranteed to be available in normal plugin
  * environments so you should not depend on them.
  */
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    * associated with this plugin instance. Used for detecting leaks. Returns
    * (uint32_t)-1 on failure.
    */
   uint32_t GetLiveObjectsForInstance([in] PP_Instance instance);
 
   /**
    * Returns PP_TRUE if the plugin is running out-of-process, PP_FALSE
    * otherwise.
    */
   PP_Bool IsOutOfProcess();
-  
+
   /**
-   * Returns PP_TRUE if the plugin is peripheral, PP_FALSE otherwise.
+   * Posts the plugin's current Power Saver status to JavaScript. The plugin
+   * itself does not recieve anything. This is not idiomatic for Pepper,
+   * but convenient for testing.
    */
-  PP_Bool IsPeripheral([in] PP_Instance instance);
+  void PostPowerSaverStatus([in] PP_Instance instance);
+
+  /**
+   * Subscribes to changes to the plugin's Power Saver status. The status
+   * changes are not forwarded to the plugin itself, but posted to JavaScript.
+   * This is not idiomatic for Pepper, but conveienent for testing.
+   */
+  void SubscribeToPowerSaverNotifications([in] PP_Instance instance);
 
   /**
    * Passes the input event to the browser, which sends it back to the
    * plugin. The plugin should implement PPP_InputEvent and register for
    * the input event type.
    *
    * This method sends an input event through the browser just as if it had
    * come from the user. If the browser determines that it is an event for the
    * plugin, it will be sent to be handled by the plugin's PPP_InputEvent
    * interface. When generating mouse events, make sure the position is within
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    * to its default. The threshold is in bytes.
    */
   void SetMinimumArrayBufferSizeForShmem([in] PP_Instance instance,
                                          [in] uint32_t threshold);
 
   /**
    * Run the V8 garbage collector for tests.
    */
   void RunV8GC([in] PP_Instance instance);
 };