Propogate the UI language on the command line and expose to Flash.

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 {
@@ skipping 29 matching lines @@
    * PP_Var on invalid instance.
    */
   PP_FLASHSETTING_INCOGNITO = 2,
 
   /**
    * Specifies if arbitrary 3d commands are supported (returns true), or if 3d
    * should only be used for drawing 2d and video (returns false).
    *
    * This should only be enabled if PP_FLASHSETTING_3DENABLED is true.
    */
-  PP_FLASHSETTING_STAGE3DENABLED = 3
+  PP_FLASHSETTING_STAGE3DENABLED = 3,
+
+  /**
+   * Specifies the string for the language code of the UI of the browser.
+   *
+   * For example: "en-US" or "de".
+   *
+   * Returns an undefined PP_Var on invalid instance.
+   */
+  PP_FLASHSETTING_LANGUAGE = 4
 };
 
 /**
  * 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 119 matching lines @@
   [version=12.3]
   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.
    */
   [version=12.4]
   PP_Var GetSetting(PP_Instance instance, PP_FlashSetting setting);
 };