Upstream the iOS web_shell and supporting code

ios/web/ios_web.gyp

 # Copyright 2014 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': [
+    {
+      'target_name': 'ios_web_app',
+      'type': 'static_library',
+      'include_dirs': [
+        '../..',
+      ],
+      'dependencies': [
+        'ios_web',
+        'ios_web_thread',
+        '../../base/base.gyp:base',
+        '../../base/base.gyp:base_i18n',
+        '../../crypto/crypto.gyp:crypto',
+        '../../net/net.gyp:net',
+        '../../ui/base/ui_base.gyp:ui_base',
+        '../../ui/gfx/gfx.gyp:gfx',
+        '../../ui/gfx/gfx.gyp:gfx_geometry',
+      ],
+      'sources': [
+        'app/web_main.mm',
+        'app/web_main_loop.h',
+        'app/web_main_loop.mm',
+        'app/web_main_runner.h',
+        'app/web_main_runner.mm',
+        'public/app/web_main.h',
+        'public/app/web_main_delegate.h',
+        'public/app/web_main_parts.h',
+        'public/app/web_main_parts.mm',
+      ],
+    },
     # Note: any embedder using ios_web will for now need to include either
     # ios_web_thread (any new embedder) or ios_web_content_thread_shim (Chrome).
     # This will become unnecessary once Chrome switches to using ios_web_thread,
     # at which point that will be folded into this target.
     {
       'target_name': 'ios_web',
       'type': 'static_library',
       'include_dirs': [
         '../..',
       ],
@@ skipping 476 matching lines @@
       'dependencies': [
         '../../base/base.gyp:base'
       ],
       'sources': [
         'public/user_agent.h',
         'public/user_agent.mm',
       ],
     },
   ],
 }