Add GPU memory tab to the task manager.

chrome/browser/resources/task_manager/defines.js

 // Copyright (c) 2012 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.
 
 /**
  * Whether task manager shows 'Private Memory' instead of 'Phsical Memory'.
  * @const
  */
 var USE_PRIVATE_MEM = false;
 // <if expr="(is_linux or pp_ifdef('chromeos'))">
@@ skipping 12 matching lines @@
   ['physicalMemory', 'physicalMemColumn', 80, !USE_PRIVATE_MEM],
   ['sharedMemory', 'sharedMemColumn', 80, false],
   ['privateMemory', 'privateMemColumn', 80, USE_PRIVATE_MEM],
   ['cpuUsage', 'cpuColumn', 80, true],
   ['networkUsage', 'netColumn', 85, true],
   ['processId', 'processIDColumn', 100, false],
   ['webCoreImageCacheSize', 'webcoreImageCacheColumn', 120, false],
   ['webCoreScriptsCacheSize', 'webcoreScriptsCacheColumn', 120, false],
   ['webCoreCSSCacheSize', 'webcoreCSSCacheColumn', 120, false],
   ['fps', 'fpsColumn', 50, true],
+  ['videoMemory', 'videoMemoryColumn', 80, false],
   ['sqliteMemoryUsed', 'sqliteMemoryUsedColumn', 80, false],
   ['goatsTeleported', 'goatsTeleportedColumn', 80, false],
   ['v8MemoryAllocatedSize', 'javascriptMemoryAllocatedColumn', 120, false],
 ];
 
 /*
  * Height of each tasks. It is 20px, which is also defined in CSS.
  * @const
  */
 var HEIGHT_OF_TASK = 20;
 
 var COMMAND_CONTEXTMENU_COLUMN_PREFIX = 'columnContextMenu';
 var COMMAND_CONTEXTMENU_TABLE_PREFIX = 'tableContextMenu';
 
 var ENABLED_COLUMNS_KEY = 'enabledColumns';
 
 var DEFAULT_SORT_COLUMN = 'cpuUsage';
 var DEFAULT_SORT_DIRECTION = 'desc';