Implement languagechange event, fired when accept languages changes.

public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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     // contents of the page overlay. It also provides an z-order number for
     // the page overlay. The z-order number defines the paint order the page
     // overlays. Page overlays with larger z-order number will be painted after
     // page overlays with smaller z-order number. That is, they appear above
     // the page overlays with smaller z-order number. If two page overlays have
     // the same z-order number, the later added one will be on top.
     virtual void addPageOverlay(WebPageOverlay*, int /*z-order*/) = 0;
     virtual void removePageOverlay(WebPageOverlay*) = 0;
 
 
+    // i18n -----------------------------------------------------------------
+
+    // Inform the WebView that the accept languages have changed.
+    // If the WebView wants to get the accept languages value, it will have
+    // to call the WebViewClient::acceptLanguages().
+    virtual void acceptLanguagesChanged() = 0;
+
     // Testing functionality for TestRunner ---------------------------------
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif