Move permission check from GuestViewInternal to derived GuestView

chrome/browser/guest_view/guest_view_base.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 CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_
 #define CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_
 
 #include <queue>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 98 matching lines @@
   // This method can be overriden by subclasses. This gives the derived class
   // an opportunity to perform setup actions before attachment.
   virtual void WillAttachToEmbedder() {}
 
   // This method is called when the guest WebContents is about to be destroyed.
   //
   // This gives the derived class an opportunity to perform some cleanup prior
   // to destruction.
   virtual void WillDestroy() {}
 
+  // This method is to be implemented by the derived class. It determines
+  // whether the guest view type of the derived class can be used by the
+  // provided embedder extension ID.
+  virtual bool CanEmbedderUseGuestView(
+      const std::string& embedder_extension_id) = 0;
+
   // This method is to be implemented by the derived class. Given a set of
   // initialization parameters, a concrete subclass of GuestViewBase can
   // create a specialized WebContents that it returns back to GuestViewBase.
   typedef base::Callback<void(content::WebContents*)>
       WebContentsCreatedCallback;
   virtual void CreateWebContents(
       const std::string& embedder_extension_id,
       int embedder_render_process_id,
       const base::DictionaryValue& create_params,
       const WebContentsCreatedCallback& callback) = 0;
@@ skipping 136 matching lines @@
   scoped_ptr<EmbedderWebContentsObserver> embedder_web_contents_observer_;
 
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<GuestViewBase> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewBase);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_