Refactor guest view availability to be API not permission based.

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 123 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. Access to guest
+  // views are determined by the availability of the internal extension API
+  // used to implement the guest view.
+  //
+  // This should be the name of the API as it appears in the _api_features.json
+  // file.
+  virtual const char* GetAPINamespace() = 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;
 
   // This creates a WebContents and initializes |this| GuestViewBase to use the
   // newly created WebContents.
   void Init(const std::string& embedder_extension_id,
-            int embedder_render_process_id,
+            content::WebContents* embedder_web_contents,
             const base::DictionaryValue& create_params,
             const WebContentsCreatedCallback& callback);
 
   void InitWithWebContents(
       const std::string& embedder_extension_id,
       int embedder_render_process_id,
       content::WebContents* guest_web_contents);
 
   bool IsViewType(const char* const view_type) const {
     return !strcmp(GetViewType(), view_type);
@@ skipping 149 matching lines @@
   gfx::Size min_auto_size_;
 
   // 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_