Add haptic feedback for selection change and action trigger.

ios/chrome/browser/ui/overscroll_actions/overscroll_actions_view.h

 // Copyright 2015 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_VIEW_H_
 #define IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_VIEW_H_
 
 #import <UIKit/UIKit.h>
 
 // Describes the current Index of an action in the OverScrollActionsView.
 enum class OverscrollAction {
   NONE,       // No action
   NEW_TAB,    // New tab action
   REFRESH,    // Refresh action
   CLOSE_TAB,  // Close tab action
 };
 
 // Describes the style of the overscroll action UI.
 enum class OverscrollStyle {
   NTP_NON_INCOGNITO,           // UI to fit the NTP in non incognito.
   NTP_INCOGNITO,               // UI to fit the NTP in incognito.
   REGULAR_PAGE_NON_INCOGNITO,  // UI to fit regular pages in non incognito.
   REGULAR_PAGE_INCOGNITO       // UI to fit regular pages in incognito.
 };
 
 @class OverscrollActionsView;
 
 @protocol OverscrollActionsViewDelegate
 
+// Called when the user explicitly taps on one of the items to trigger its
+// action.
 - (void)overscrollActionsViewDidTapTriggerAction:
     (OverscrollActionsView*)overscrollActionsView;
 
+// Called after the selectedAction property changed and the animations have
+// been triggered.
+- (void)overscrollActionsView:(OverscrollActionsView*)view
+      selectedActionDidChange:(OverscrollAction)newAction;
+
 @end
 
 // This view displays the actions of the OverscrollActionsController.
 // How actions are displayed depends on the vertical and horizontal offsets.
 @interface OverscrollActionsView : UIView
 
 // The currently selected action.
 @property(nonatomic, assign, readonly) OverscrollAction selectedAction;
 // The view displayed has the background of the overscroll actions view.
 @property(nonatomic, retain, readonly) UIView* backgroundView;
@@ skipping 22 matching lines @@
 // This starts an "ink response" like animation typically triggered when an
 // action has been selected.
 - (void)displayActionAnimation;
 
 // Sets the style of the overscroll action UI.
 - (void)setStyle:(OverscrollStyle)style;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_VIEW_H_