Don't expect ack for ViewMsg_OnResize if backing size is empty

content/public/test/render_widget_test.h

Index: content/public/test/render_widget_test.h
diff --git a/content/public/test/render_widget_test.h b/content/public/test/render_widget_test.h
index 45a5f74216805846ef9cdfc301336be2865eb78c..9884c2be36af184ffa9d222b14217aaa7e81c86c 100644
--- a/content/public/test/render_widget_test.h
+++ b/content/public/test/render_widget_test.h
@@ -42,6 +42,9 @@ class RenderWidgetTest : public RenderViewTest {
   // Test for ResizeAndPaint.
   void TestResizeAndPaint();
 
+  // Test for OnResize and Resize.
+  void TestOnResize();
+
   // Helper function which returns true if the given bitmap contains the given
   // ARGB color and false otherwise.
   bool ImageContainsColor(const SkBitmap& bitmap, uint32 argb_color);