Add PermissionPromptAndroid skeleton

chrome/browser/permissions/grouped_permission_infobar_delegate_android.h

 // Copyright 2016 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_PERMISSIONS_GROUPED_PERMISSION_INFOBAR_DELEGATE_ANDROID_H_
 #define CHROME_BROWSER_PERMISSIONS_GROUPED_PERMISSION_INFOBAR_DELEGATE_ANDROID_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 43 matching lines @@
  private:
   GroupedPermissionInfoBarDelegate(
       const GURL& requesting_origin,
       const std::vector<PermissionRequest*>& requests);
 
   // ConfirmInfoBarDelegate:
   InfoBarIdentifier GetIdentifier() const override;
   Type GetInfoBarType() const override;
   int GetButtons() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
+  GroupedPermissionInfoBarDelegate* AsGroupedPermissionInfoBarDelegate()
+      override;
 
   const GURL requesting_origin_;
   const std::vector<PermissionRequest*> requests_;
   std::vector<bool> accept_states_;
   // Whether the accept/deny decision is persisted.
   bool persist_;
 
   DISALLOW_COPY_AND_ASSIGN(GroupedPermissionInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_GROUPED_PERMISSION_INFOBAR_DELEGATE_ANDROID_H_