Make the Most Visited tile focus state more apparent to match the online NTP.

chrome/browser/resources/local_ntp/local_ntp.js

 // Copyright 2013 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.
 
 
 /**
  * @fileoverview The local InstantExtended NTP and suggestions dropdown.
  */
 
 (function() {
@@ skipping 37 matching lines @@
   PAGE: 'mv-page', // page tiles
   PAGE_READY: 'mv-page-ready',  // page tile when ready
   ROW: 'mv-row',  // tile row
   RTL: 'rtl',  // sets element alignments for an RTL language
   SEARCH: 'search',
   SELECTED: 'selected', // a selected suggestion (if any)
   SUGGESTION: 'suggestion',
   SUGGESTION_CONTENTS: 'suggestion-contents',
   SUGGESTIONS_BOX: 'suggestions-box',
   THUMBNAIL: 'mv-thumb',
+  THUMBNAIL_MASK: 'mv-mask',
   // Applied when user types. Makes fakebox non-interactive and hides
   // scrollbars. Removed on ESC.
   USER_TYPED: 'user-typed',
   TILE: 'mv-tile',
   TITLE: 'mv-title'
 };
 
 
 /**
  * Enum for HTML element ids.
@@ skipping 391 matching lines @@
         MOST_VISITED_THUMBNAIL_IFRAME, rid, MOST_VISITED_COLOR,
         MOST_VISITED_FONT_FAMILY, MOST_VISITED_FONT_SIZE, false, position);
     thumbnailElement.hidden = true;
     thumbnailElement.onload = function() {
       thumbnailElement.hidden = false;
       tileElement.classList.add(CLASSES.PAGE_READY);
     };
     thumbnailElement.className = CLASSES.THUMBNAIL;
     tileElement.appendChild(thumbnailElement);
 
+    // A mask to darken the thumbnail on focus.
+    var maskElement = createAndAppendElement(
+        tileElement, 'div', CLASSES.THUMBNAIL_MASK);
+
     // The button used to blacklist this page.
     var blacklistButton = createAndAppendElement(
         tileElement, 'div', CLASSES.BLACKLIST_BUTTON);
     var blacklistFunction = generateBlacklistFunction(rid);
     blacklistButton.addEventListener('click', blacklistFunction);
     blacklistButton.title = templateData.removeThumbnailTooltip;
 
     // When a tile is focused, have delete also blacklist the page.
     registerKeyHandler(tileElement, KEYCODE.DELETE, blacklistFunction);
 
@@ skipping 1255 matching lines @@
   }
 }
 
 document.addEventListener('DOMContentLoaded', init);
 window.addEventListener('message', handleMessage, false);
 window.addEventListener('blur', function() {
   if (activeBox)
     activeBox.clearHover();
 }, false);
 })();