Update SetPaintToLayer to accept LayerType

ash/common/system/web_notification/web_notification_tray.cc

Index: ash/common/system/web_notification/web_notification_tray.cc
diff --git a/ash/common/system/web_notification/web_notification_tray.cc b/ash/common/system/web_notification/web_notification_tray.cc
index 0cbd26d5899eb95ff4b9eb327855071e71670a80..c6965dfd9632629fa0309c67616ca65e5aa4df6a 100644
--- a/ash/common/system/web_notification/web_notification_tray.cc
+++ b/ash/common/system/web_notification/web_notification_tray.cc
@@ -29,6 +29,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/compositor/layer_type.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/paint_vector_icon.h"
@@ -124,7 +125,7 @@ class WebNotificationItem : public views::View, public gfx::AnimationDelegate {
   WebNotificationItem(gfx::AnimationContainer* container,
                       WebNotificationTray* tray)
       : tray_(tray) {
-    SetPaintToLayer(true);
+    SetPaintToLayer(ui::LAYER_TEXTURED);
     layer()->SetFillsBoundsOpaquely(false);
     views::View::SetVisible(false);
     set_owned_by_client();