cc: Push valid property values when CalcDrawProps skips layer.

cc/layers/tiled_layer.cc

Index: cc/layers/tiled_layer.cc
diff --git a/cc/layers/tiled_layer.cc b/cc/layers/tiled_layer.cc
index 753cdfa2862e1b5140ca692aba9825c352d7169d..8e0318d7a134a11d36305fdbc5795e506e09d4e6 100644
--- a/cc/layers/tiled_layer.cc
+++ b/cc/layers/tiled_layer.cc
@@ -734,7 +734,11 @@ bool TiledLayer::Update(ResourceUpdateQueue* queue,
     base::AutoReset<bool> ignore_set_needs_commit(&ignore_set_needs_commit_,
                                                   true);
 
-    ContentsScalingLayer::Update(queue, occlusion);
+    bool contents_scaling_layer_updated =
+        ContentsScalingLayer::Update(queue, occlusion);
+    DCHECK(!contents_scaling_layer_updated) <<
+        "If this is true, then any return value below would need to " <<
+        "return true."
     UpdateBounds();
   }