ntp: adjust top padding

chrome/browser/resources/ntp4/tile_page.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('ntp4', function() {
   'use strict';
 
   // We can't pass the currently dragging tile via dataTransfer because of
   // http://crbug.com/31037
   var currentlyDraggingTile = null;
@@ skipping 879 matching lines @@
 
     updateTopMargin_: function() {
       var layout = this.layoutValues_;
 
       // The top margin is set so that the vertical midpoint of the grid will
       // be 1/3 down the page.
       var numTiles = this.tileCount +
           (this.isCurrentDragTarget && !this.withinPageDrag_ ? 1 : 0);
       var numRows = Math.ceil(numTiles / layout.numRowTiles);
       var usedHeight = layout.rowHeight * numRows;
-      // 100 matches the top padding of tile-page.
+      // 60 matches the top padding of tile-page (which acts as the minimum).
       var newMargin = document.documentElement.clientHeight / 3 -
-          usedHeight / 2 - 100 - this.content_.offsetTop;
+          usedHeight / 3 - 60;
       newMargin = Math.max(newMargin, 0);
 
       // |newMargin| is the final margin we actually want to show. However,
       // part of that should be animated and part should not (for the same
       // reason as with leftMargin). The approach is to consider differences
       // when the layout changes from wide to narrow or vice versa as
       // 'animatable'. These differences accumulate in animatedTopMarginPx_,
       // while topMarginPx_ caches the real (total) margin. Either of these
       // calculations may come out to be negative, so we use margins as the
       // css property.
@@ skipping 317 matching lines @@
       assert(false);
     },
   };
 
   return {
     getCurrentlyDraggingTile: getCurrentlyDraggingTile,
     setCurrentDropEffect: setCurrentDropEffect,
     TilePage: TilePage,
   };
 });