Make it possible to run Sky apps offline

sky/shell/dart/dart_library_provider_files.h

Index: sky/shell/dart/dart_library_provider_files.h
diff --git a/sky/shell/dart/dart_library_provider_files.h b/sky/shell/dart/dart_library_provider_files.h
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+++ b/sky/shell/dart/dart_library_provider_files.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_SHELL_DART_DART_LIBRARY_PROVIDER_FILES_H_
+#define SKY_SHELL_DART_DART_LIBRARY_PROVIDER_FILES_H_
+
+#include "base/files/file_path.h"
+#include "sky/engine/tonic/dart_library_provider.h"
+
+namespace sky {
+namespace shell {
+
+class DartLibraryProviderFiles : public blink::DartLibraryProvider {
+ public:
+  explicit DartLibraryProviderFiles(const base::FilePath& package_root);
+  ~DartLibraryProviderFiles() override;
+
+ protected:
+  // |DartLibraryProvider| implementation:
+  void GetLibraryAsStream(const String& name,
+                          blink::DataPipeConsumerCallback callback) override;
+  Dart_Handle CanonicalizeURL(Dart_Handle library, Dart_Handle url) override;
+
+ private:
+  std::string CanonicalizePackageURL(std::string url);
+
+  base::FilePath package_root_;
+
+  DISALLOW_COPY_AND_ASSIGN(DartLibraryProviderFiles);
+};
+
+}  // namespace shell
+}  // namespace sky
+
+#endif  // SKY_SHELL_DART_DART_LIBRARY_PROVIDER_FILES_H_