Make it possible to run Sky apps offline

sky/engine/core/script/dart_library_provider_webview.h

Index: sky/engine/core/script/dart_library_provider_webview.h
diff --git a/sky/engine/core/script/dart_library_provider_webview.h b/sky/engine/core/script/dart_library_provider_webview.h
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+// 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.
+
+#ifndef SKY_ENGINE_CORE_SCRIPT_DART_LIBRARY_PROVIDER_WEBVIEW_H_
+#define SKY_ENGINE_CORE_SCRIPT_DART_LIBRARY_PROVIDER_WEBVIEW_H_
+
+#include "sky/engine/tonic/dart_library_provider.h"
+#include "sky/engine/wtf/HashSet.h"
+#include "sky/engine/wtf/OwnPtr.h"
+
+namespace blink {
+
+class DartLibraryProviderWebView : public DartLibraryProvider {
+ public:
+  explicit DartLibraryProviderWebView();
+  ~DartLibraryProviderWebView() override;
+
+ private:
+  class Job;
+
+  // |DartLibraryProvider| implementation:
+  void GetLibraryAsStream(
+      const String& name,
+      DataPipeConsumerCallback callback)
+      override;
+
+  Dart_Handle CanonicalizeURL(Dart_Handle library, Dart_Handle url) override;
+
+  HashSet<OwnPtr<Job>> jobs_;
+};
+
+}  // namespace blink
+
+#endif  // SKY_ENGINE_CORE_SCRIPT_DART_LIBRARY_PROVIDER_WEBVIEW_H_