Add support for rel=next to Prerender in Blink.

Source/web/tests/PrerenderingTest.cpp

 /*
  * Copyright (C) 2012 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 243 matching lines @@
     FrameTestHelpers::WebViewHelper m_webViewHelper;
 };
 
 TEST_F(PrerenderingTest, SinglePrerender)
 {
     initialize("http://www.foo.com/", "prerender/single_prerender.html");
 
     WebPrerender webPrerender = prerendererClient()->releaseWebPrerender();
     EXPECT_FALSE(webPrerender.isNull());
     EXPECT_EQ(toWebURL("http://prerender.com/"), webPrerender.url());
+    EXPECT_EQ(PrerenderRelTypePrerender, webPrerender.relTypes());
 
     EXPECT_EQ(1u, prerenderingSupport()->addCount(webPrerender));
     EXPECT_EQ(1u, prerenderingSupport()->totalCount());
 
     webPrerender.didStartPrerender();
     EXPECT_EQ(1u, consoleLength());
     EXPECT_EQ("webkitprerenderstart", consoleAt(0));
 
     webPrerender.didSendDOMContentLoadedForPrerender();
     EXPECT_EQ(2u, consoleLength());
@@ skipping 210 matching lines @@
     EXPECT_EQ(1u, prerenderingSupport()->addCount(webPrerender));
     EXPECT_EQ(0u, prerenderingSupport()->cancelCount(webPrerender));
     EXPECT_EQ(1u, prerenderingSupport()->totalCount());
 
     // Change the rel of this prerender, make sure this is treated as a remove.
     executeScript("mutateRel()");
     EXPECT_EQ(1u, prerenderingSupport()->cancelCount(webPrerender));
     EXPECT_EQ(2u, prerenderingSupport()->totalCount());
 }
 
+TEST_F(PrerenderingTest, RelNext)
+{
+    initialize("http://www.foo.com/", "prerender/rel_next_prerender.html");
+
+    WebPrerender relNextOnly = prerendererClient()->releaseWebPrerender();
+    EXPECT_EQ(toWebURL("http://rel-next-only.com/"), relNextOnly.url());
+    EXPECT_EQ(PrerenderRelTypeNext, relNextOnly.relTypes());
+
+    WebPrerender relNextAndPrerender = prerendererClient()->releaseWebPrerender();
+    EXPECT_EQ(toWebURL("http://rel-next-and-prerender.com/"), relNextAndPrerender.url());
+    EXPECT_EQ(static_cast<unsigned>(PrerenderRelTypeNext | PrerenderRelTypePrerender), relNextAndPrerender.relTypes());
+}
+
 } // namespace