Fix crashes when NinePatchLayer doesn't have a resource.

cc/layers/nine_patch_layer_impl.cc

Index: cc/layers/nine_patch_layer_impl.cc
diff --git a/cc/layers/nine_patch_layer_impl.cc b/cc/layers/nine_patch_layer_impl.cc
index 103f7656eb85c5ad24212f680306ce1ed9e4b507..4274bf00af17da64a015880563c700c9f324df80 100644
--- a/cc/layers/nine_patch_layer_impl.cc
+++ b/cc/layers/nine_patch_layer_impl.cc
@@ -64,12 +64,13 @@ bool NinePatchLayerImpl::WillDraw(DrawMode draw_mode,
 
 void NinePatchLayerImpl::AppendQuads(QuadSink* quad_sink,
                                      AppendQuadsData* append_quads_data) {
-  DCHECK(resource_id_);
-
   SharedQuadState* shared_quad_state =
       quad_sink->UseSharedQuadState(CreateSharedQuadState());
   AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
 
+  if (!resource_id_)
+    return;
+
   static const bool flipped = false;
   static const bool premultiplied_alpha = true;