Introduce new API Language() to test lang attribute that is properly reported.

content/shell/renderer/test_runner/web_ax_object_proxy.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_SHELL_RENDERER_TEST_RUNNER_WEB_AX_OBJECT_PROXY_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_WEB_AX_OBJECT_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 44 matching lines @@
 
  private:
   friend class WebAXObjectProxyBindings;
 
   // Bound properties.
   std::string Role();
   std::string Title();
   std::string Description();
   std::string HelpText();
   std::string StringValue();
+  std::string Language();
   int X();
   int Y();
   int Width();
   int Height();
   int IntValue();
   int MinValue();
   int MaxValue();
   std::string ValueDescription();
   int ChildrenCount();
   int InsertionPointLineNumber();
@@ skipping 83 matching lines @@
   v8::Handle<v8::Object> CreateRoot(const blink::WebAXObject&);
 
  private:
   typedef v8::PersistentValueVector<v8::Object> ElementList;
   ElementList elements_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_WEB_AX_OBJECT_PROXY_H_