[NotLanded] Implement the fetching algorithm of the Web Manifest.

Source/core/loader/ManifestLoader.h

+// 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.
+
+#ifndef ManifestLoader_h
+#define ManifestLoader_h
+
+#include "core/fetch/ResourceClient.h"
+#include "core/fetch/ResourceOwner.h"
+#include "core/frame/LocalFrame.h"
+
+namespace blink {
+
+class Document;
+
+// The ManifestLoader is a class that fetches and parses a WebManifest and
+// informs the FrameLoaderClient upon completion (success or failure).
+// The lifetime of the object is managed by itself. When ::LoadManifest() is
+// called, an instance of the object is created and as soon as the processing
+// is finished, the object will destroy itself.
+class ManifestLoader FINAL : public ResourceOwner<Resource, ResourceClient> {
+public:
+    static void loadManifest(PassRefPtr<LocalFrame>);
+
+    // This is public so we can use OwnPtr<>(this) in various methods.
+    virtual ~ManifestLoader();
+
+protected:
+    // ResourceClient
+    virtual void notifyFinished(Resource*) OVERRIDE;
+
+    explicit ManifestLoader(PassRefPtr<LocalFrame>);
+
+    void startLoading();
+
+private:
+    RefPtr<LocalFrame> m_frame;
+};
+
+} // namespace blink
+
+#endif