Add ink drop ripple to status tray

ash/common/system/user/tray_user.cc

Index: ash/common/system/user/tray_user.cc
diff --git a/ash/common/system/user/tray_user.cc b/ash/common/system/user/tray_user.cc
index c061d4d6dcfa0a2501ce95f9dd0986758d5bdde2..98f009e95588162ee4901b0c52f454f171d289cf 100644
--- a/ash/common/system/user/tray_user.cc
+++ b/ash/common/system/user/tray_user.cc
@@ -157,6 +157,10 @@ void TrayUser::UpdateAfterLoginStatusChange(LoginStatus status) {
     }
     if (need_avatar) {
       avatar_ = new tray::RoundedImageView(kTrayRoundedBorderRadius, true);
+      if (MaterialDesignController::IsShelfMaterial()) {
+        avatar_->SetPaintToLayer(true);
+        avatar_->layer()->SetFillsBoundsOpaquely(false);
+      }
       layout_view_->AddChildView(avatar_);
     } else {
       avatar_ = nullptr;