Enable HTTP loading in Mojo dart content handler

tonic/dart_library_provider_network.h

Index: tonic/dart_library_provider_network.h
diff --git a/tonic/dart_library_provider_network.h b/tonic/dart_library_provider_network.h
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+++ b/tonic/dart_library_provider_network.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 TONIC_DART_LIBRARY_PROVIDER_NETWORK_H_
+#define TONIC_DART_LIBRARY_PROVIDER_NETWORK_H_
+
+#include <unordered_set>
+
+#include "mojo/services/network/public/interfaces/network_service.mojom.h"
+#include "tonic/dart_library_provider.h"
+
+namespace tonic {
+
+class DartLibraryProviderNetwork : public DartLibraryProvider {
+ public:
+  explicit DartLibraryProviderNetwork(mojo::NetworkService* network_service);
+  ~DartLibraryProviderNetwork() override;
+
+  mojo::NetworkService* network_service() const { return network_service_; }
+
+ protected:
+  // |DartLibraryProvider| implementation:
+  void GetLibraryAsStream(const std::string& name,
+                          DataPipeConsumerCallback callback) override;
+  Dart_Handle CanonicalizeURL(Dart_Handle library, Dart_Handle url) override;
+
+ private:
+  class Job;
+
+  mojo::NetworkService* network_service_;
+  std::unordered_set<std::unique_ptr<Job>> jobs_;
+
+  DISALLOW_COPY_AND_ASSIGN(DartLibraryProviderNetwork);
+};
+
+}  // namespace tonic
+
+#endif  // TONIC_DART_LIBRARY_PROVIDER_NETWORK_H_