Implement the logic to find the correct <link> for Manifest in Document.

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 700 matching lines @@
     clearStyleResolver();
 }
 
 DOMImplementation& Document::implementation()
 {
     if (!m_implementation)
         m_implementation = DOMImplementation::create(*this);
     return *m_implementation;
 }
 
-bool Document::hasManifest() const
+bool Document::hasAppCacheManifest() const
 {
     return isHTMLHtmlElement(documentElement()) && documentElement()->hasAttribute(manifestAttr);
 }
 
 Location* Document::location() const
 {
     if (!frame())
         return 0;
 
     return &domWindow()->location();
@@ skipping 1723 matching lines @@
     HTMLElement* oldBody = body();
     if (oldBody == newBody)
         return;
 
     if (oldBody)
         documentElement()->replaceChild(newBody.release(), oldBody, exceptionState);
     else
         documentElement()->appendChild(newBody.release(), exceptionState);
 }
 
-HTMLHeadElement* Document::head()
+HTMLHeadElement* Document::head() const
 {
     Node* de = documentElement();
     if (!de)
         return 0;
 
     return Traversal<HTMLHeadElement>::firstChild(*de);
 }
 
 Element* Document::viewportDefiningElement(RenderStyle* rootStyle) const
 {
@@ skipping 2203 matching lines @@
 
     if (firstTouchIcon.m_iconType != InvalidIcon)
         iconURLs.append(firstTouchIcon);
     if (firstTouchPrecomposedIcon.m_iconType != InvalidIcon)
         iconURLs.append(firstTouchPrecomposedIcon);
     for (int i = secondaryIcons.size() - 1; i >= 0; --i)
         iconURLs.append(secondaryIcons[i]);
     return iconURLs;
 }
 
+HTMLLinkElement* Document::linkManifest() const
+{
+    HTMLHeadElement* head = this->head();
+    if (!head)
+        return 0;
+
+    // The first link element with a manifest rel must be used. Others are ignored.
+    for (HTMLLinkElement* linkElement = Traversal<HTMLLinkElement>::firstChild(*head); linkElement; linkElement = Traversal<HTMLLinkElement>::nextSibling(*linkElement)) {
+        if (!linkElement->relAttribute().isManifest())
+            continue;
+        return linkElement;
+    }
+
+    return 0;
+}
+
 void Document::setUseSecureKeyboardEntryWhenActive(bool usesSecureKeyboard)
 {
     if (m_useSecureKeyboardEntryWhenActive == usesSecureKeyboard)
         return;
 
     m_useSecureKeyboardEntryWhenActive = usesSecureKeyboard;
     m_frame->selection().updateSecureKeyboardEntryIfActive();
 }
 
 bool Document::useSecureKeyboardEntryWhenActive() const
@@ skipping 1009 matching lines @@
     visitor->trace(m_visibilityObservers);
     visitor->trace(m_userActionElements);
     visitor->registerWeakMembers<Document, &Document::clearWeakMembers>(this);
     DocumentSupplementable::trace(visitor);
     TreeScope::trace(visitor);
     ContainerNode::trace(visitor);
     ExecutionContext::trace(visitor);
 }
 
 } // namespace WebCore