Skip drawing unsupported layers in forced software mode

cc/layers/delegated_renderer_layer_impl.cc

Index: cc/layers/delegated_renderer_layer_impl.cc
diff --git a/cc/layers/delegated_renderer_layer_impl.cc b/cc/layers/delegated_renderer_layer_impl.cc
index 60a00777c37a4330ecb65dea8a37c7495c1621c5..f1930981dc3d45ec152a2f39accbd5b6efb4f24d 100644
--- a/cc/layers/delegated_renderer_layer_impl.cc
+++ b/cc/layers/delegated_renderer_layer_impl.cc
@@ -255,6 +255,13 @@ void DelegatedRendererLayerImpl::AppendContributingRenderPasses(
   }
 }
 
+bool DelegatedRendererLayerImpl::WillDraw(DrawMode draw_mode,
+                                          ResourceProvider* resource_provider) {
+  if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
+    return false;
+  return LayerImpl::WillDraw(draw_mode, resource_provider);
+}
+
 void DelegatedRendererLayerImpl::AppendQuads(
     QuadSink* quad_sink,
     AppendQuadsData* append_quads_data) {