predictors: Mark before_first_contentful_paint for resources fetched before fcp.

chrome/browser/resources/predictors/resource_prefetch_predictor.js

 // 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.
 
 /**
  * Requests the database from the backend.
  */
 function requestResourcePrefetchPredictorDb() {
   chrome.send('requestResourcePrefetchPredictorDb');
 }
@@ skipping 74 matching lines @@
       row.appendChild(document.createElement('td')).textContent =
           resource.number_of_hits;
       row.appendChild(document.createElement('td')).textContent =
           resource.number_of_misses;
       row.appendChild(document.createElement('td')).textContent =
           resource.consecutive_misses;
       row.appendChild(document.createElement('td')).textContent =
           resource.position;
       row.appendChild(document.createElement('td')).textContent =
           resource.score;
+      row.appendChild(document.createElement('td')).textContent =
+          resource.before_first_contentful_paint;
       body.appendChild(row);
     }
   }
 }
 
 document.addEventListener('DOMContentLoaded',
                           requestResourcePrefetchPredictorDb);