New link rel=prerender api, using WebKit::WebPrerenderingPlatform

chrome/renderer/prerender/prerenderer_client.h

Index: chrome/renderer/prerender/prerenderer_client.h
diff --git a/chrome/renderer/prerender/prerenderer_client.h b/chrome/renderer/prerender/prerenderer_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..274750625ce1b56cd96cc86f54bf18fb4b5f217b
--- /dev/null
+++ b/chrome/renderer/prerender/prerenderer_client.h
@@ -0,0 +1,27 @@
+// 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.
+
+#ifndef CHROME_RENDERER_PRERENDER_PRERENDERER_CLIENT_H_
+#define CHROME_RENDERER_PRERENDER_PRERENDERER_CLIENT_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "content/public/renderer/render_view_observer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPrerendererClient.h"
+
+namespace prerender {
+
+class PrerendererClient : public content::RenderViewObserver,

[dominich, 2012/04/30 15:52:05]

I don't understand why this is both a RenderViewObserver and a
WebPrerendererClient.

[mmenke, 2012/04/30 18:35:22]

Do we really need one of these per render view, instead of one per process?  Not
concerned about memory, but I don't like global variables when we don't need
them.

[gavinp, 2012/04/30 23:55:39]

This class is a WebPrerendererClient, it's called from WebKit before
Prerendering, and it adds the ExtraData, which is the size and the new
prerender_id.  It needs to be a RenderViewObserver, so that it can find the size
of the current RenderView.

[gavinp, 2012/04/30 23:55:39]

The implementation of PrerendererClient::willAddPrerender() gets the size of the
current RenderView for the request.  That feels pretty per-RenderView to me, I
think?

[mmenke, 2012/05/01 16:23:21]

That should be "We don't maintain per-RenderView state".  Presumably
someone...or something... retrieved us via the RenderView.  Anyways, not a big
deal.

+                          public WebKit::WebPrerendererClient {
+ public:
+  explicit PrerendererClient(content::RenderView* render_view);
+  virtual ~PrerendererClient();
+
+  virtual void willAddPrerender(WebKit::WebPrerender* prerender) OVERRIDE;
+};
+
+}  // namespace prerender
+
+#endif  // CHROME_RENDERER_PRERENDER_PRERENDERER_CLIENT_H_
+