Relanding "views: Add a gyp file to build webview.". Try 2.

ash/ash.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,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
 
@@ skipping 15 matching lines @@
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../ui/app_list/app_list.gyp:app_list',
         '../ui/aura/aura.gyp:aura',
         '../ui/base/strings/ui_strings.gyp:ui_strings',
         '../ui/compositor/compositor.gyp:compositor',
         '../ui/oak/oak.gyp:oak',
         '../ui/ui.gyp:ui',
         '../ui/ui.gyp:ui_resources',
         '../ui/ui.gyp:ui_resources_wallpapers',
+        '../ui/views/controls/webview/webview.gyp:webview',
         '../ui/views/views.gyp:views',
         '../ui/web_dialogs/web_dialogs.gyp:web_dialogs',
       ],
       'defines': [
         'ASH_IMPLEMENTATION',
       ],
       'sources': [
         # All .cc, .h under ash, except unittests
         'accelerators/accelerator_controller.cc',
         'accelerators/accelerator_controller.h',
@@ skipping 586 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }