cc: Make DisplayItemList::Append replay into an SkPicture

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 439d9200a911013def3d661b844531acffee0b08..e9603b646e9b7ace0181887428a9ba068069ccd7 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -64,7 +64,7 @@ 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; }
 };