Support for chrome.experimental.popup API in ExternalTabContainer views

chrome/browser/dom_ui/dom_ui.h

 // Copyright (c) 2009 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 CHROME_BROWSER_DOM_UI_DOM_UI_H_
 #define CHROME_BROWSER_DOM_UI_DOM_UI_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 93 matching lines @@
   // There are two function variants for one-arg and two-arg calls.
   void CallJavascriptFunction(const std::wstring& function_name);
   void CallJavascriptFunction(const std::wstring& function_name,
                               const Value& arg);
   void CallJavascriptFunction(const std::wstring& function_name,
                               const Value& arg1,
                               const Value& arg2);
 
   ThemeProvider* GetThemeProvider() const;
 
-  TabContents* tab_contents() { return tab_contents_; }
+  TabContents* tab_contents() const { return tab_contents_; }
 
   Profile* GetProfile();
 
  protected:
   void AddMessageHandler(DOMMessageHandler* handler);
 
   // Options that may be overridden by individual DOM UI implementations. The
   // bool options default to false. See the public getters for more information.
   bool hide_favicon_;
   bool force_bookmark_bar_visible_;
@@ skipping 50 matching lines @@
   // Extract a string value from a Value.
   std::wstring ExtractStringValue(const Value* value);
 
   DOMUI* dom_ui_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DOMMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_DOM_UI_H_