Apply new MD shadows to CrOS tray bubbles.

ui/views/bubble/tray_bubble_view.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 "ui/views/bubble/tray_bubble_view.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 178 matching lines @@
 TrayBubbleView::TrayBubbleView(View* anchor,
                                Delegate* delegate,
                                const InitParams& init_params)
     : BubbleDialogDelegateView(anchor,
                                GetArrowAlignment(init_params.anchor_alignment)),
       params_(init_params),
       layout_(new BottomAlignedBoxLayout(this)),
       delegate_(delegate),
       preferred_width_(init_params.min_width),
       bubble_border_(new BubbleBorder(arrow(),
-                                      BubbleBorder::BIG_SHADOW,
+                                      BubbleBorder::NO_ASSETS,
                                       init_params.bg_color)),
       owned_bubble_border_(bubble_border_),
       is_gesture_dragging_(false),
       mouse_actively_entered_(false) {
   bubble_border_->set_alignment(BubbleBorder::ALIGN_EDGE_TO_ANCHOR_EDGE);
   bubble_border_->set_paint_arrow(BubbleBorder::PAINT_NONE);
   set_can_activate(params_.can_activate);
   DCHECK(anchor_widget());  // Computed by BubbleDialogDelegateView().
   set_notify_enter_exit_on_child(true);
   set_close_on_deactivate(init_params.close_on_deactivate);
@@ skipping 55 matching lines @@
 }
 
 int TrayBubbleView::GetDialogButtons() const {
   return ui::DIALOG_BUTTON_NONE;
 }
 
 void TrayBubbleView::OnBeforeBubbleWidgetInit(Widget::InitParams* params,
                                               Widget* bubble_widget) const {
   if (delegate_)
     delegate_->OnBeforeBubbleWidgetInit(anchor_widget(), bubble_widget, params);
+  // Apply a WM-provided shadow (see ui/wm/core/).
+  params->shadow_type = Widget::InitParams::SHADOW_TYPE_DROP;
 }
 
 NonClientFrameView* TrayBubbleView::CreateNonClientFrameView(Widget* widget) {
   BubbleFrameView* frame = static_cast<BubbleFrameView*>(
       BubbleDialogDelegateView::CreateNonClientFrameView(widget));
   frame->SetBubbleBorder(std::move(owned_bubble_border_));
   return frame;
 }
 
 bool TrayBubbleView::WidgetHasHitTestMask() const {
@@ skipping 88 matching lines @@
 
 void TrayBubbleView::ViewHierarchyChanged(
     const ViewHierarchyChangedDetails& details) {
   if (details.is_add && details.child == this) {
     details.parent->SetPaintToLayer(true);
     details.parent->layer()->SetMasksToBounds(true);
   }
 }
 
 }  // namespace views