Use ink drop hover for focus states on toolbar buttons and location

ash/system/toast/toast_overlay.cc

 // Copyright 2016 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/system/toast/toast_overlay.h"
 
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
@@ skipping 98 matching lines @@
 //  ToastOverlayButton
 class ToastOverlayButton : public views::LabelButton {
  public:
   explicit ToastOverlayButton(views::ButtonListener* listener,
                               const base::string16& label);
   ~ToastOverlayButton() override {}
 
  private:
   friend class ToastOverlay;  // for ToastOverlay::ClickDismissButtonForTesting.
 
-  // Controls the visual feedback for the button state.
-  std::unique_ptr<views::InkDropDelegate> ink_drop_delegate_;
-
   DISALLOW_COPY_AND_ASSIGN(ToastOverlayButton);
 };
 
 ToastOverlayButton::ToastOverlayButton(views::ButtonListener* listener,
                                        const base::string16& text)
-    : views::LabelButton(listener, text),
-      ink_drop_delegate_(new views::ButtonInkDropDelegate(this, this)) {
-  set_ink_drop_delegate(ink_drop_delegate_.get());
+    : views::LabelButton(listener, text) {
+  set_ink_drop_delegate(
+      base::WrapUnique(new views::ButtonInkDropDelegate(this, this)));
   set_has_ink_drop_action_on_click(true);
   set_ink_drop_base_color(SK_ColorWHITE);
 
   ui::ResourceBundle* rb = &ui::ResourceBundle::GetSharedInstance();
 
   SetEnabledTextColors(kButtonTextColor);
   SetFontList(rb->GetFontList(kTextFontStyle));
 
   // Treat the space below the baseline as a margin.
   int verticalSpacing = kToastVerticalSpacing -
@@ skipping 153 matching lines @@
 
 views::Widget* ToastOverlay::widget_for_testing() {
   return overlay_widget_.get();
 }
 
 void ToastOverlay::ClickDismissButtonForTesting(const ui::Event& event) {
   overlay_view_->button()->NotifyClick(event);
 }
 
 }  // namespace ash