Add tiles to the experimental app list start page.

ui/app_list/app_list.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 120 matching lines @@
         'views/search_result_list_view.h',
         'views/search_result_list_view_delegate.h',
         'views/search_result_view.cc',
         'views/search_result_view.h',
         'views/signin_view.cc',
         'views/signin_view.h',
         'views/speech_view.cc',
         'views/speech_view.h',
         'views/start_page_view.cc',
         'views/start_page_view.h',
+        'views/tile_item_view.cc',
+        'views/tile_item_view.h',
         'views/top_icon_animation_view.cc',
         'views/top_icon_animation_view.h',
       ],
       'conditions': [
         ['use_aura==1', {
           'dependencies': [
             '../aura/aura.gyp:aura',
             '../wm/wm.gyp:wm',
           ],
         }],
@@ skipping 124 matching lines @@
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
       # Disable c4267 warnings until we fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }