Update SetPaintToLayer to accept LayerType

ash/common/system/tray/tray_background_view.cc

Index: ash/common/system/tray/tray_background_view.cc
diff --git a/ash/common/system/tray/tray_background_view.cc b/ash/common/system/tray/tray_background_view.cc
index 4fdc3dcf30b35fcd3e4fa62dac4f8c228099127b..4715f0a60459395b83fba0e0fea41948003036cf 100644
--- a/ash/common/system/tray/tray_background_view.cc
+++ b/ash/common/system/tray/tray_background_view.cc
@@ -24,6 +24,7 @@
 #include "ui/base/nine_image_painter_factory.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_element.h"
+#include "ui/compositor/layer_type.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/animation/tween.h"
@@ -302,7 +303,7 @@ TrayBackgroundView::TrayBackgroundView(WmShelf* wm_shelf)
   SetContents(tray_container_);
   tray_event_filter_.reset(new TrayEventFilter);
 
-  SetPaintToLayer(true);
+  SetPaintToLayer(ui::LAYER_TEXTURED);
   layer()->SetFillsBoundsOpaquely(false);
   // Start the tray items not visible, because visibility changes are animated.
   views::View::SetVisible(false);