Make it possible to run Sky apps offline

sky/viewer/BUILD.gn

 # 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.
 
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojo_native_application("viewer") {
   output_name = "sky_viewer"
 
   sources = [
     "content_handler_impl.cc",
     "content_handler_impl.h",
     "converters/basic_types.cc",
     "converters/basic_types.h",
     "converters/input_event_types.cc",
     "converters/input_event_types.h",
+    "dart_library_provider_impl.cc",
+    "dart_library_provider_impl.h",
     "document_view.cc",
     "document_view.h",
     "internals.cc",
     "internals.h",
     "runtime_flags.cc",
     "runtime_flags.h",
     "viewer.cc",
   ]
 
   include_dirs = [ ".." ]
@@ skipping 18 matching lines @@
     "//mojo/services/service_registry/public/interfaces",
     "//mojo/services/surfaces/public/interfaces",
     "//mojo/services/view_manager/public/cpp",
     "//mojo/services/view_manager/public/interfaces",
     "//skia",
     "//sky/compositor",
     "//sky/engine",
     "//sky/engine/tonic",
     "//sky/services/platform",
     "//sky/services/testing:bindings",
+    "//sky/shell/dart",
     "//third_party/icu",
     "//ui/events",
     "//url",
   ]
 }