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

Source/core/html/HTMLLinkElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 25 matching lines @@
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/events/EventSender.h"
 #include "core/dom/StyleEngine.h"
 #include "core/fetch/CSSStyleSheetResource.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
+#include "core/html/LinkManifest.h"
 #include "core/html/imports/LinkImport.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/FrameLoaderClient.h"
 #include "wtf/StdLibExtras.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 template <typename CharacterType>
@@ skipping 143 matching lines @@
 
 LinkResource* HTMLLinkElement::linkResourceToProcess()
 {
     bool visible = inDocument() && !m_isInShadowTree;
     if (!visible) {
         ASSERT(!linkStyle() || !linkStyle()->hasSheet());
         return 0;
     }
 
     if (!m_link) {
-        if (m_relAttribute.isImport() && RuntimeEnabledFeatures::htmlImportsEnabled())
+        if (m_relAttribute.isImport() && RuntimeEnabledFeatures::htmlImportsEnabled()) {
             m_link = LinkImport::create(this);
-        else {
+        } else if (m_relAttribute.isManifest() && RuntimeEnabledFeatures::manifestEnabled()) {
+            m_link = LinkManifest::create(this);
+        } else {
             OwnPtrWillBeRawPtr<LinkStyle> link = LinkStyle::create(this);
             if (fastHasAttribute(disabledAttr))
                 link->setDisabledState(true);
             m_link = link.release();
         }
     }
 
     return m_link.get();
 }
 
@@ skipping 479 matching lines @@
         removePendingSheet(RemovePendingSheetNotifyLater);
 }
 
 void LinkStyle::trace(Visitor* visitor)
 {
     visitor->trace(m_sheet);
     LinkResource::trace(visitor);
 }
 
 } // namespace WebCore