Add <link rel=next> support to prerender.

chrome/common/prerender_messages.h

Index: chrome/common/prerender_messages.h
diff --git a/chrome/common/prerender_messages.h b/chrome/common/prerender_messages.h
index 2b0310c2e277025d36fcab8c3992b8fed2c5206b..21ce04538cae3a9ec5b024ee46c78312c98c77db 100644
--- a/chrome/common/prerender_messages.h
+++ b/chrome/common/prerender_messages.h
@@ -18,11 +18,16 @@
 // These are messages sent from the renderer to the browser in
 // relation to <link rel=prerender> elements.
 
+IPC_STRUCT_BEGIN(PrerenderAttributes)
+  IPC_STRUCT_MEMBER(GURL, url)
+  IPC_STRUCT_MEMBER(uint32, rel_types)
+IPC_STRUCT_END()
+
 // Notifies of the insertion of a <link rel=prerender> element in the
 // document.
 IPC_MESSAGE_CONTROL5(PrerenderHostMsg_AddLinkRelPrerender,
                      int /* prerender_id, assigned by WebPrerendererClient */,
-                     GURL /* url */,
+                     PrerenderAttributes,
                      content::Referrer,
                      gfx::Size,
                      int /* render_view_route_id of launcher */)