Add ink drop ripple to status tray

ash/common/system/user/tray_user.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/user/tray_user.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/system_tray.h"
@@ skipping 139 matching lines @@
 
     if (need_label) {
       label_ = new views::Label;
       SetupLabelForTray(label_);
       layout_view_->AddChildView(label_);
     } else {
       label_ = nullptr;
     }
     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;
     }
   }
 
   if (delegate->IsUserSupervised()) {
     label_->SetText(
         l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_SUPERVISED_LABEL));
   } else if (status == LoginStatus::GUEST) {
@@ skipping 82 matching lines @@
   // Unit tests might come here with no images for some users.
   if (avatar_->size().IsEmpty())
     avatar_->SetSize(gfx::Size(kTrayItemSize, kTrayItemSize));
 }
 
 void TrayUser::UpdateLayoutOfItem() {
   UpdateAfterShelfAlignmentChange(system_tray()->shelf_alignment());
 }
 
 }  // namespace ash