Detect <link rel='manifest'> and notify embedder.

Source/core/html/LinkManifest.h

Index: Source/core/html/LinkManifest.h
diff --git a/Source/core/html/LinkManifest.h b/Source/core/html/LinkManifest.h
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+++ b/Source/core/html/LinkManifest.h
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+// 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 LinkManifest_h
+#define LinkManifest_h
+
+#include "core/html/LinkResource.h"
+#include "wtf/FastAllocBase.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace WebCore {
+
+class HTMLLinkElement;
+
+class LinkManifest FINAL : public LinkResource {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+
+    static PassOwnPtr<LinkManifest> create(HTMLLinkElement* owner);
+
+    virtual ~LinkManifest();
+
+    // LinkResource
+    virtual void process() OVERRIDE;
+    virtual Type type() const OVERRIDE { return Manifest; }
+    virtual bool hasLoaded() const OVERRIDE;
+    virtual void ownerRemoved() OVERRIDE;
+
+private:
+    explicit LinkManifest(HTMLLinkElement* owner);
+};
+
+}
+
+#endif // LinkManifest_h