Add support for rel=next to Prerender in Blink.

Source/core/html/LinkRelAttribute.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 namespace WebCore {
 
 LinkRelAttribute::LinkRelAttribute()
     : m_iconType(InvalidIcon)
     , m_isStyleSheet(false)
     , m_isAlternate(false)
     , m_isDNSPrefetch(false)
     , m_isLinkPrefetch(false)
     , m_isLinkSubresource(false)
     , m_isLinkPrerender(false)
+    , m_isLinkNext(false)
     , m_isImport(false)
 {
 }
 
 LinkRelAttribute::LinkRelAttribute(const String& rel)
     : m_iconType(InvalidIcon)
     , m_isStyleSheet(false)
     , m_isAlternate(false)
     , m_isDNSPrefetch(false)
     , m_isLinkPrefetch(false)
     , m_isLinkSubresource(false)
     , m_isLinkPrerender(false)
+    , m_isLinkNext(false)
     , m_isImport(false)
 {
     if (equalIgnoringCase(rel, "stylesheet")) {
         m_isStyleSheet = true;
     } else if (equalIgnoringCase(rel, "icon") || equalIgnoringCase(rel, "shortcut icon")) {
         m_iconType = Favicon;
     } else if (equalIgnoringCase(rel, "dns-prefetch")) {
         m_isDNSPrefetch = true;
     } else if (equalIgnoringCase(rel, "alternate stylesheet") || equalIgnoringCase(rel, "stylesheet alternate")) {
         m_isStyleSheet = true;
@@ skipping 21 matching lines @@
             } else if (equalIgnoringCase(*it, "alternate")) {
                 m_isAlternate = true;
             } else if (equalIgnoringCase(*it, "icon")) {
                 m_iconType = Favicon;
             } else if (equalIgnoringCase(*it, "prefetch")) {
                 m_isLinkPrefetch = true;
             } else if (equalIgnoringCase(*it, "subresource")) {
                 m_isLinkSubresource = true;
             } else if (equalIgnoringCase(*it, "prerender")) {
                 m_isLinkPrerender = true;
+            } else if (equalIgnoringCase(*it, "next")) {
+                m_isLinkNext = true;
             } else if (equalIgnoringCase(*it, "apple-touch-icon")) {
                 if (RuntimeEnabledFeatures::touchIconLoadingEnabled()) {
                     m_iconType = TouchIcon;
                 }
             } else if (equalIgnoringCase(*it, "apple-touch-icon-precomposed")) {
                 if (RuntimeEnabledFeatures::touchIconLoadingEnabled()) {
                     m_iconType = TouchPrecomposedIcon;
                 }
             }
         }
     }
 }
 
 }