cc: Give non-drawing layers that are rasterized a lower priority.

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index f497b7d533bdcbf1c8aa79d7adb2380372a0dc8e..0bee75ad045c1350e8b92ce32f2f1d1631ec5e38 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -576,6 +576,10 @@ class CC_EXPORT LayerImpl {
   // layers) and consumed by LayerTreeImpl::PushPropertiesTo during activation.
   bool needs_show_scrollbars_ : 1;
 
+  // This is set for layers that have a property because of which they are not
+  // drawn (singular transforms), but they can become visible soon (the property
+  // is being animated). For this reason, while these layers are not drawn, they
+  // are still rasterized.
   bool raster_even_if_not_in_rsll_ : 1;

[jaydasika, 2017/05/24 22:17:55]

nit : we don't have a rsll anymore. Maybe this should be
raster_even_if_not_drawn ?

[Khushal, 2017/05/25 02:52:59]

Yeah, that's better. I'll change it.

 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);