cc: Mark layers with invalid property tree indices as non-drawable.

cc/trees/draw_property_utils.cc

Index: cc/trees/draw_property_utils.cc
diff --git a/cc/trees/draw_property_utils.cc b/cc/trees/draw_property_utils.cc
index ff443e2eda43fb8828f89955a7027de3bbd6cd3b..c9c729d32d014a59d63e81a0cbb80d7939cb4ef4 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -851,6 +851,7 @@ void FindLayersThatNeedUpdates(LayerTreeImpl* layer_tree_impl,
     // removed as layer_impl should not be nullptr here.
     if (!layer_impl || !layer_impl->HasValidPropertyTreeIndices())
       continue;
+
     if (!IsRootLayer(layer_impl) &&
         LayerShouldBeSkippedForDrawPropertiesComputation(
             layer_impl, transform_tree, effect_tree))