cc: Make DisplayItemList::Append replay into an SkPicture

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 51994c74db535963f23bea466da78a6369c85e07..4aa1b959815234045b8dd7e4540b84acb8bf947a 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -1329,7 +1329,7 @@ class TestOpacityChangeLayerDelegate : public ContentLayerClient {
       const gfx::Rect& clip,
       PaintingControlSetting picture_control) override {
     NOTIMPLEMENTED();
-    return DisplayItemList::Create();
+    return DisplayItemList::Create(clip);
   }
   bool FillsBoundsCompletely() const override { return false; }
 
@@ -2794,7 +2794,7 @@ class LayerTreeHostTestChangeLayerPropertiesInPaintContents
         const gfx::Rect& clip,
         PaintingControlSetting picture_control) override {
       NOTIMPLEMENTED();
-      return DisplayItemList::Create();
+      return DisplayItemList::Create(clip);
     }
 
     bool FillsBoundsCompletely() const override { return false; }