[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 7d7e8f33803bae80773c0b110cc18faf1bdaa9d1..3366750a888994b097f21285872aee193465435e 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -376,6 +376,11 @@ 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;