Show the settings button on a pinned notification.

ui/message_center/views/padded_button.cc

 // Copyright 2013 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/message_center/views/padded_button.h"
 
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/views/animation/flood_fill_ink_drop_ripple.h"
@@ skipping 11 matching lines @@
   SetFocusPainter(views::Painter::CreateSolidFocusPainter(
       kFocusBorderColor,
       gfx::Insets(1, 2, 2, 2)));
   set_background(views::Background::CreateSolidBackground(
       SkColorSetA(SK_ColorWHITE, 0.9 * 0xff)));
   SetBorder(views::CreateEmptyBorder(gfx::Insets(kControlButtonBorderSize)));
   set_animate_on_state_change(false);
 
   SetInkDropMode(InkDropMode::ON);
   set_ink_drop_base_color(SkColorSetA(SK_ColorBLACK, 0.6 * 0xff));
+  set_has_ink_drop_action_on_click(true);
 }
 
 std::unique_ptr<views::InkDrop> PaddedButton::CreateInkDrop() {
   auto ink_drop = CreateDefaultInkDropImpl();
   ink_drop->SetShowHighlightOnHover(false);
   ink_drop->SetShowHighlightOnFocus(false);
   return std::move(ink_drop);
 }
 
 std::unique_ptr<views::InkDropRipple> PaddedButton::CreateInkDropRipple()
     const {
   return base::MakeUnique<views::FloodFillInkDropRipple>(
       size(), GetInkDropCenterBasedOnLastEvent(),
       SkColorSetA(SK_ColorBLACK, 0.6 * 255), ink_drop_visible_opacity());
 }
 
 }  // namespace message_center