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

Source/core/html/LinkManifest.cpp

+// 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.
+
+#include "config.h"
+#include "core/html/LinkManifest.h"
+
+#include "core/dom/Document.h"
+#include "core/frame/LocalFrame.h"
+#include "core/html/HTMLLinkElement.h"
+#include "core/loader/FrameLoaderClient.h"
+
+namespace WebCore {
+
+PassOwnPtrWillBeRawPtr<LinkManifest> LinkManifest::create(HTMLLinkElement* owner)
+{
+    return adoptPtrWillBeNoop(new LinkManifest(owner));
+}
+
+LinkManifest::LinkManifest(HTMLLinkElement* owner)
+    : LinkResource(owner)
+{
+}
+
+LinkManifest::~LinkManifest()
+{
+}
+
+void LinkManifest::process()
+{
+    if (!m_owner || !m_owner->document().frame())
+        return;
+
+    m_owner->document().frame()->loader().client()->dispatchDidChangeManifest();
+}
+
+bool LinkManifest::hasLoaded() const
+{
+    return false;
+}
+
+void LinkManifest::ownerRemoved()
+{
+    process();
+}
+
+} // namespace WebCore