**NOTFORLANDING** New link rel=prerender API

chrome/renderer/prerender/prerender_extra_data.cc

+// 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.
+
+#include "chrome/renderer/prerender/prerender_extra_data.h"
+
+#include "base/logging.h"
+
+namespace prerender {
+
+PrerenderExtraData::PrerenderExtraData(
+    int prerender_id,
+    int render_view_route_id,
+    const gfx::Size& size)
+    : prerender_id_(prerender_id),
+      render_view_route_id_(render_view_route_id),
+      size_(size) {
+}
+
+// static
+const PrerenderExtraData& PrerenderExtraData::fromPrerender(
+    const WebKit::WebPrerender& prerender) {
+  DCHECK(prerender.extraData());
+  return static_cast<const PrerenderExtraData&>(*prerender.extraData());
+}
+
+}  // namespace webkit_glue