[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"
+
+namespace blink {
+class WebManifestRequest;
+}
+
+namespace WebCore {
+
+class Document;
+
+// The ManifestLoader is a class that fetches and parses a WebManifest and
+// informs the passed WebManifestRequest 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.
+// The call should make sure that the WebManifestRequest passed to
+// ::LoadManifest() is not destroyed before getting a result.
+class ManifestLoader FINAL : public ResourceOwner<Resource, ResourceClient> {
+public:
+    static void loadManifest(blink::WebManifestRequest*, Document*);
+
+    // This is public so we can use OwnPtr<>(this) in order in various methods.
+    virtual ~ManifestLoader();
+
+protected:
+    // ResourceClient
+    virtual void notifyFinished(Resource*) OVERRIDE;
+
+    explicit ManifestLoader(blink::WebManifestRequest*);
+
+    void startLoading(Document*);
+
+private:
+    blink::WebManifestRequest* m_request;
+};
+
+} // namespace WebCore
+
+#endif