[gtk] add oauth2 scopes zippies in extension install dialog

chrome/browser/extensions/extension_install_prompt.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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 58 matching lines @@
     PromptType type() const { return type_; }
     void set_type(PromptType type) { type_ = type; }
 
     // Getters for UI element labels.
     string16 GetDialogTitle() const;
     string16 GetHeading() const;
     string16 GetAcceptButtonLabel() const;
     bool HasAbortButtonLabel() const;
     string16 GetAbortButtonLabel() const;
     string16 GetPermissionsHeading() const;
+    string16 GetOAuthHeading() const;
 
     // Getters for webstore metadata. Only populated when the type is
     // INLINE_INSTALL_PROMPT.
 
     // The star display logic replicates the one used by the webstore (from
     // components.ratingutils.setFractionalYellowStars). Callers pass in an
     // "appender", which will be repeatedly called back with the star images
     // that they append to the star display area.
     typedef void(*StarAppender)(const gfx::ImageSkia*, void*);
     void AppendRatingStars(StarAppender appender, void* data) const;
@@ skipping 200 matching lines @@
   PromptType prompt_type_;
 
   scoped_ptr<OAuth2MintTokenFlow> token_flow_;
 
   // Keeps track of extension images being loaded on the File thread for the
   // purpose of showing the install UI.
   ImageLoadingTracker tracker_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_H_