Add a section for the fullscreen JS API in the content settings page.

chrome/browser/resources/options/content_settings_exceptions_area.js

 // Copyright (c) 2011 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.
 
 cr.define('options.contentSettings', function() {
   const InlineEditableItemList = options.InlineEditableItemList;
   const InlineEditableItem = options.InlineEditableItem;
   const ArrayDataModel = cr.ui.ArrayDataModel;
 
   /**
@@ skipping 64 matching lines @@
         select.appendChild(optionAsk);
       }
 
       if (this.contentType == 'cookies') {
         var optionSession = cr.doc.createElement('option');
         optionSession.textContent = templateData.sessionException;
         optionSession.value = 'session';
         select.appendChild(optionSession);
       }
 
-      var optionBlock = cr.doc.createElement('option');
-      optionBlock.textContent = templateData.blockException;
-      optionBlock.value = 'block';
-      select.appendChild(optionBlock);
+      if (this.contentType != 'fullscreen') {
+        var optionBlock = cr.doc.createElement('option');
+        optionBlock.textContent = templateData.blockException;
+        optionBlock.value = 'block';
+        select.appendChild(optionBlock);
+      }
 
       this.contentElement.appendChild(select);
       select.className = 'exception-setting';
       if (this.pattern)
         select.setAttribute('displaymode', 'edit');
 
       // Used to track whether the URL pattern in the input is valid.
       // This will be true if the browser process has informed us that the
       // current text in the input is valid. Changing the text resets this to
       // false, and getting a response from the browser sets it back to true.
@@ skipping 255 matching lines @@
         }
       }
 
       this.mode = this.getAttribute('mode');
 
       var exceptionList = this;
 
       // Whether the exceptions in this list allow an 'Ask every time' option.
       this.enableAskOption = (this.contentType == 'plugins' &&
                               templateData.enable_click_to_play);
-
+      this.enableAskOption = (this.enableAskOption ||
+                              this.contentType == 'fullscreen');
       this.autoExpands = true;
       this.reset();
     },
 
     /**
      * Creates an item to go in the list.
      * @param {Object} entry The element from the data model for this row.
      */
     createItem: function(entry) {
       if (entry) {
@@ skipping 165 matching lines @@
     }
   };
 
   return {
     ExceptionsListItem: ExceptionsListItem,
     ExceptionsAddRowListItem: ExceptionsAddRowListItem,
     ExceptionsList: ExceptionsList,
     ContentSettingsExceptionsArea: ContentSettingsExceptionsArea,
   };
 });