Add an asynchronous version of the Flash DeviceID API.

ppapi/c/private/ppb_flash.h

 /* 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.
  */
 
 /* From private/ppb_flash.idl modified Thu Jun  7 12:41:56 2012. */
 
 #ifndef PPAPI_C_PRIVATE_PPB_FLASH_H_
 #define PPAPI_C_PRIVATE_PPB_FLASH_H_
 
@@ skipping 149 matching lines @@
    * Does nothing, deprecated. See PPB_Flash_Print.
    */
   int32_t (*InvokePrinting)(PP_Instance instance);
   /**
    * Indicates that there's activity and, e.g., the screensaver shouldn't kick
    * in.
    */
   void (*UpdateActivity)(PP_Instance instance);
   /**
    * Returns the device ID as a string. Returns a PP_VARTYPE_UNDEFINED on error.
+   * Deprecated, use GetDeviceIDAsync.
    */
   struct PP_Var (*GetDeviceID)(PP_Instance instance);
   /**
    * Deprecated. See GetSetting().
    */
   int32_t (*GetSettingInt)(PP_Instance instance, PP_FlashSetting setting);
   /**
    * Returns the value associated with the given setting. Invalid enums will
    * result in an undefined PP_Var return value.
    */
@@ skipping 108 matching lines @@
   void (*UpdateActivity)(PP_Instance instance);
   struct PP_Var (*GetDeviceID)(PP_Instance instance);
   int32_t (*GetSettingInt)(PP_Instance instance, PP_FlashSetting setting);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_FLASH_H_ */