Make it possible to run Sky apps offline

sky/viewer/dart_library_provider_impl.cc

+// 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.
+
+#include "sky/viewer/dart_library_provider_impl.h"
+
+namespace sky {
+
+DartLibraryProviderImpl::PrefetchedLibrary::PrefetchedLibrary() {
+}
+
+DartLibraryProviderImpl::PrefetchedLibrary::~PrefetchedLibrary() {
+}
+
+DartLibraryProviderImpl::DartLibraryProviderImpl(
+    mojo::NetworkService* network_service,
+    scoped_ptr<PrefetchedLibrary> prefetched)
+    : shell::DartLibraryProviderNetwork(network_service),
+      prefetched_library_(prefetched.Pass()) {
+}
+
+DartLibraryProviderImpl::~DartLibraryProviderImpl() {
+}
+
+void DartLibraryProviderImpl::GetLibraryAsStream(
+    const String& name,
+    blink::DataPipeConsumerCallback callback) {
+  if (prefetched_library_ && prefetched_library_->name == name) {
+    mojo::ScopedDataPipeConsumerHandle pipe = prefetched_library_->pipe.Pass();
+    prefetched_library_ = nullptr;
+    callback.Run(pipe.Pass());
+    return;
+  }
+
+  shell::DartLibraryProviderNetwork::GetLibraryAsStream(name, callback);
+}
+
+}  // namespace sky