Use the WebTestProxy for layout tests in content_shell

content/layouttest_support/content_layouttest_support.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.

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

why a top level dir under content for just one file, i.e. especially since this
is only used by tests.

seems like this (and the public file) should both be in content/public/test

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/public/layouttest_support/content_layouttest_support.h"
+
+#include "content/renderer/render_view_impl.h"
+#include "third_party/WebKit/Tools/DumpRenderTree/chromium/TestRunner/public/WebTestProxy.h"
+
+using WebTestRunner::WebTestProxy;
+using WebTestRunner::WebTestProxyBase;
+
+namespace content {
+
+RenderViewImpl* CreateWebTestProxy(RenderViewImplParams* params,
+                                   WebTestRunner::WebTestProxyBase** base) {
+  typedef WebTestProxy<RenderViewImpl, RenderViewImplParams*> ProxyType;
+  ProxyType* render_view_proxy = new ProxyType(
+      reinterpret_cast<RenderViewImplParams*>(params));
+  if (base)
+    *base = static_cast<WebTestProxyBase*>(render_view_proxy);
+  return render_view_proxy;
+}
+
+}  // namespace content