Add a Flash API to get the device ID.

ppapi/api/private/ppb_flash.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 the <code>PPB_Flash</code> interface.
  */
 
 label Chrome {
   M17 = 12.0,
-  M19 = 12.1
+  M19 = 12.1,
+  M20 = 12.2
 };
 
 /**
  * The <code>PPB_Flash</code> interface contains pointers to various functions
  * that are only needed to support Pepper Flash.
  */
 interface PPB_Flash {
   /**
    * Sets or clears the rendering hint that the given plugin instance is always
    * on top of page content. Somewhat more optimized painting can be used in
@@ skipping 99 matching lines @@
   int32_t InvokePrinting(
       [in] PP_Instance instance);
 
   /**
    * Indicates that there's activity and, e.g., the screensaver shouldn't kick
    * in.
    */
   [version=12.1]
   void UpdateActivity(
       [in] PP_Instance instance);
+
+  /**
+   * Returns the device ID as a string. Returns a PP_VARTYPE_UNDEFINED on error.
+   */
+  [version=12.2]
+  PP_Var GetDeviceID([in] PP_Instance instance);
 };
 
 #inline c
 /**
  * The old version of the interface, which cannot be generated from IDL.
  * TODO(viettrungluu): Remove this when enough time has passed. crbug.com/104184
  */
 #define PPB_FLASH_INTERFACE_11_0 "PPB_Flash;11"
 struct PPB_Flash_11 {
   void (*SetInstanceAlwaysOnTop)(PP_Instance instance, PP_Bool on_top);
@@ skipping 10 matching lines @@
   struct PP_Var (*GetProxyForURL)(PP_Instance instance, const char* url);
   int32_t (*Navigate)(PP_Resource request_info,
                       const char* target,
                       bool from_user_action);
   void (*RunMessageLoop)(PP_Instance instance);
   void (*QuitMessageLoop)(PP_Instance instance);
   double (*GetLocalTimeZoneOffset)(PP_Instance instance, PP_Time t);
   struct PP_Var (*GetCommandLineArgs)(PP_Module module);
 };
 #endinl