Use the WebTestProxy for layout tests in content_shell

content/shell/shell_content_renderer_client.h

Index: content/shell/shell_content_renderer_client.h
diff --git a/content/shell/shell_content_renderer_client.h b/content/shell/shell_content_renderer_client.h
index 1dff8e2a69b699e566f368e713d4c64dfda040cc..d0a649cc470e67a3c3d122a3f60035a54950334f 100644
--- a/content/shell/shell_content_renderer_client.h
+++ b/content/shell/shell_content_renderer_client.h
@@ -19,6 +19,7 @@ namespace content {
 
 class RenderView;
 class ShellRenderProcessObserver;
+class WebKitTestRunner;
 
 class ShellContentRendererClient : public ContentRendererClient {
  public:
@@ -26,6 +27,9 @@ class ShellContentRendererClient : public ContentRendererClient {
   virtual ~ShellContentRendererClient();
   virtual void RenderThreadStarted() OVERRIDE;
   virtual void RenderViewCreated(RenderView* render_view) OVERRIDE;
+  virtual bool OverrideCreateRenderViewImpl(
+      RenderViewImplParams* params,
+      RenderViewImpl** render_view) OVERRIDE;
   virtual bool OverrideCreatePlugin(
       RenderView* render_view,
       WebKit::WebFrame* frame,
@@ -34,6 +38,7 @@ class ShellContentRendererClient : public ContentRendererClient {
 
  private:
   scoped_ptr<ShellRenderProcessObserver> shell_observer_;
+  WebKitTestRunner* latest_test_runner_;
 };
 
 }  // namespace content