Fix iOS builds after ShellView refactor on Android

sky/shell/BUILD.gn

 # Copyright 2015 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.
 
 common_deps = [
   "//base",
   "//base:i18n",
   "//build/config/sanitizers:deps",
   "//dart/runtime:libdart",
   "//mojo/common",
@@ skipping 139 matching lines @@
         "ios/sky_app_delegate.h",
         "ios/sky_app_delegate.mm",
         "ios/sky_surface.h",
         "ios/sky_surface.mm",
         "ios/sky_view_controller.h",
         "ios/sky_view_controller.mm",
         "platform_view.cc",
         "platform_view.h",
         "shell.cc",
         "shell.h",
+        "shell_view.cc",
+        "shell_view.h",
         "ui/animator.cc",
         "ui/animator.h",
         "ui/engine.cc",
         "ui/engine.h",
         "ui/input_event_converter.cc",
         "ui/input_event_converter.h",
         "ui/internals.cc",
         "ui/internals.h",
         "ui_delegate.cc",
         "ui_delegate.h",
       ]
 
       ios_deps = [ "//sky/services/ns_net" ]
 
       deps = common_deps + ios_deps
     }
 
     deps = [
       ":$scaffolding_target",
       ":sky_resources",
     ]
   }
 } else {
   assert(false, "Unsupported platform")
 }