Look for favicon URLs (and similar <link>s) in SVG documents

third_party/WebKit/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.
@@ skipping 5230 matching lines @@
     return;
   view()->beginLifecycleUpdates();
 }
 
 Vector<IconURL> Document::iconURLs(int iconTypesMask) {
   IconURL firstFavicon;
   IconURL firstTouchIcon;
   IconURL firstTouchPrecomposedIcon;
   Vector<IconURL> secondaryIcons;
 
-  // Start from the last child node so that icons seen later take precedence as
+  using TraversalFunction = HTMLLinkElement* (*)(const Node&);
+  TraversalFunction findNextCandidate =
+      &Traversal<HTMLLinkElement>::nextSibling;
+
+  HTMLLinkElement* firstElement = nullptr;
+  if (head()) {
+    firstElement = Traversal<HTMLLinkElement>::firstChild(*head());
+  } else if (isSVGDocument() && isSVGSVGElement(documentElement())) {
+    firstElement = Traversal<HTMLLinkElement>::firstWithin(*documentElement());
+    findNextCandidate = &Traversal<HTMLLinkElement>::next;
+  }
+
+  // Start from the first child node so that icons seen later take precedence as
   // required by the spec.
-  for (HTMLLinkElement* linkElement =
-           head() ? Traversal<HTMLLinkElement>::firstChild(*head()) : 0;
-       linkElement;
-       linkElement = Traversal<HTMLLinkElement>::nextSibling(*linkElement)) {
+  for (HTMLLinkElement* linkElement = firstElement; linkElement;
+       linkElement = findNextCandidate(*linkElement)) {
     if (!(linkElement->getIconType() & iconTypesMask))
       continue;
     if (linkElement->href().isEmpty())
       continue;
 
     IconURL newURL(linkElement->href(), linkElement->iconSizes(),
                    linkElement->type(), linkElement->getIconType());
     if (linkElement->getIconType() == Favicon) {
       if (firstFavicon.m_iconType != InvalidIcon)
         secondaryIcons.push_back(firstFavicon);
@@ skipping 1208 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif