cc: Make DisplayItemList::Append replay into an SkPicture

cc/layers/picture_layer_unittest.cc

Index: cc/layers/picture_layer_unittest.cc
diff --git a/cc/layers/picture_layer_unittest.cc b/cc/layers/picture_layer_unittest.cc
index 2f64693a7270a35689e9cf01b575b3a94e7178fa..fd0a197495e6e1b5822b8a6f2c432d4f7f583503 100644
--- a/cc/layers/picture_layer_unittest.cc
+++ b/cc/layers/picture_layer_unittest.cc
@@ -29,7 +29,7 @@ class MockContentLayerClient : public ContentLayerClient {
       const gfx::Rect& clip,
       PaintingControlSetting picture_control) override {
     NOTIMPLEMENTED();
-    return DisplayItemList::Create();
+    return DisplayItemList::Create(clip);
   }
   bool FillsBoundsCompletely() const override { return false; };
 };