Apply new MD shadows to CrOS tray bubbles.

ui/views/bubble/tray_bubble_view.cc

Index: ui/views/bubble/tray_bubble_view.cc
diff --git a/ui/views/bubble/tray_bubble_view.cc b/ui/views/bubble/tray_bubble_view.cc
index 53a050606e6e86622582a524c42eacbb9c09bbf1..11cae58f74e7a009a8c04ebf43e756111b232350 100644
--- a/ui/views/bubble/tray_bubble_view.cc
+++ b/ui/views/bubble/tray_bubble_view.cc
@@ -173,7 +173,6 @@ TrayBubbleView::InitParams::InitParams(AnchorAlignment anchor_alignment,
       min_width(min_width),
       max_width(max_width),
       max_height(0),
-      can_activate(false),
       close_on_deactivate(true),
       bg_color(gfx::kPlaceholderColor) {}
 
@@ -196,14 +195,14 @@ TrayBubbleView::TrayBubbleView(View* anchor,
       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);
+  set_can_activate(true);

[msw, 2016/12/08 22:09:46]

nit: this is true by default; remove the explicit init

   DCHECK(anchor_widget());  // Computed by BubbleDialogDelegateView().
   set_notify_enter_exit_on_child(true);
   set_close_on_deactivate(init_params.close_on_deactivate);
@@ -272,6 +271,7 @@ void TrayBubbleView::OnBeforeBubbleWidgetInit(Widget::InitParams* params,
                                               Widget* bubble_widget) const {
   if (delegate_)
     delegate_->OnBeforeBubbleWidgetInit(anchor_widget(), bubble_widget, params);
+  params->shadow_type = Widget::InitParams::SHADOW_TYPE_DROP;
 }
 
 NonClientFrameView* TrayBubbleView::CreateNonClientFrameView(Widget* widget) {