**NOTFORLANDING** New link rel=prerender API

chrome/common/prerender_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Multiply-included message file, no traditional include guard.
+#include "content/public/common/referrer.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_param_traits.h"
+#include "ui/gfx/size.h"
 
 #define IPC_MESSAGE_START PrerenderMsgStart
 
+IPC_ENUM_TRAITS(WebKit::WebReferrerPolicy)
+
+IPC_STRUCT_TRAITS_BEGIN(content::Referrer)
+  IPC_STRUCT_TRAITS_MEMBER(url)
+  IPC_STRUCT_TRAITS_MEMBER(policy)
+IPC_STRUCT_TRAITS_END()
+
+// Prerender Link Manager Messages
+// These are messages sent from the renderer to the browser in
+// relation to <link rel=prerender> elements.
+
+// Notifies of the insertion of a <link rel=prerender> element in the
+// document.
+IPC_MESSAGE_CONTROL5(PrerenderMsg_NewLinkPrerender,

[cbentzel, 2012/03/29 00:13:37]

These should be named PrerenderHostMsg to differentiate that they are
render->browser. I also think they could be ROUTED messages if you move to
listening in a WebContentsObserver.

[gavinp, 2012/04/20 17:54:15]

Done.

+                     int /* prerender_id, assigned in WebCore */,
+                     int /* render_view_route_id of launcher */,
+                     GURL /* href from the element */,
+                     content::Referrer,
+                     gfx::Size);
+
+// Notifies on removal of a <link rel=prerender> element from the document.
+IPC_MESSAGE_CONTROL1(PrerenderMsg_RemovedLinkPrerender,
+                     int /* id, assigned by the WebCore::PrerenderHandle */)
+
+// Notifies on unloading a <link rel=prerender> element from a frame.
+IPC_MESSAGE_CONTROL1(PrerenderMsg_UnloadedLinkPrerender,
+                     int /* id, assigned by the WebCore::PrerenderHandle */)
+
+// Prerender View Host Messages
+// These are messages sent in relation to running prerenders.
+
 // Tells a renderer if it's currently being prerendered.  Must only be set
 // to true before any navigation occurs, and only set to false at most once
 // after that.
 IPC_MESSAGE_ROUTED1(PrerenderMsg_SetIsPrerendering,
                     bool /* whether the RenderView is prerendering */)
 
 // Specifies that a URL is currently being prerendered.
 IPC_MESSAGE_CONTROL1(PrerenderMsg_AddPrerenderURL,
                      GURL /* url */)
 
 // Specifies that a URL is no longer being prerendered.
 IPC_MESSAGE_CONTROL1(PrerenderMsg_RemovePrerenderURL,
                      GURL /* url */)