[content shell] implement auto resize related WebTestDelegate interfaces

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 466f293bc52da43034a5c5cefb66bec1f5aa1744..61cba301ddfc3eb146775fff68edad85e7458476 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -380,6 +380,11 @@ class CONTENT_EXPORT RenderViewImpl
   // Change the device scale factor and force the compositor to resize.
   void SetDeviceScaleFactorForTesting(float factor);
 
+  // Control autoresize mode.
+  void EnableAutoResizeForTesting(const gfx::Size& min_size,
+                                  const gfx::Size& max_size);
+  void DisableAutoResizeForTesting(const gfx::Size& new_size);
+
   // IPC::Listener implementation ----------------------------------------------
 
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;