Use the WebTestProxy for layout tests in content_shell

content/public/layouttest_support/content_layouttest_support.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.
+
+#ifndef CONTENT_PUBLIC_LAYOUTTEST_SUPPORT_CONTENT_LAYOUTTEST_SUPPORT_H_
+#define CONTENT_PUBLIC_LAYOUTTEST_SUPPORT_CONTENT_LAYOUTTEST_SUPPORT_H_
+
+#include "content/common/content_export.h"
+
+namespace WebTestRunner {
+class WebTestProxyBase;
+}
+
+namespace content {
+
+class RenderViewImpl;
+struct RenderViewImplParams;
+
+// Create a RenderViewImpl instance that is wrapped in the WebTestProxy
+// template. |params| is passed to RenderViewImpl's constructor. If |base| is
+// non-NULL, it will be set to a pointer to the WebTestProxy instance.
+CONTENT_EXPORT RenderViewImpl* CreateWebTestProxy(

[jam, 2012/11/08 17:18:08]

so webkit code now knows about RenderViewImpl? I naively thought it would just
be a WebViewClient that they'd care about?

also, anything in public has to use only public classes/structs. so if this is
public, RenderViewImplParams would have to be public. why is that struct needed?
can you point me to where this function is called so I can see an example?

+    RenderViewImplParams* params,
+    WebTestRunner::WebTestProxyBase** base);
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_LAYOUTTEST_SUPPORT_CONTENT_LAYOUTTEST_SUPPORT_H_