Add haptic feedback for selection change and action trigger.

ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.mm

 // 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.
 
 #import "ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <algorithm>
+#include "base/ios/ios_util.h"
 #include "base/logging.h"
 #include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/metrics/histogram_macros.h"
 #import "ios/chrome/browser/ui/browser_view_controller.h"
 #import "ios/chrome/browser/ui/overscroll_actions/overscroll_actions_view.h"
 #include "ios/chrome/browser/ui/rtl_geometry.h"
 #import "ios/chrome/browser/ui/toolbar/toolbar_controller.h"
 #import "ios/chrome/browser/ui/toolbar/web_toolbar_controller.h"
 #import "ios/chrome/browser/ui/voice/voice_search_notification_names.h"
@@ skipping 624 matching lines @@
   // Not doing so would result in a graphic issue where the scrollview jumps
   // when scrolling after a change in UI orientation.
   [[self scrollView] panGestureRecognizer].enabled = NO;
   [[self scrollView] panGestureRecognizer].enabled = YES;
 
   [self setScrollViewContentInset:UIEdgeInsetsMake(self.initialContentInset, 0,
                                                    0, 0)];
   [self clear];
 }
 
+// On iOS10 and above, trigger a haptic vibration for the user selecting an
+// action. This is a no-op for devices that do not support it.
+- (void)triggerHapticFeedbackForAction {
+  if (base::ios::IsRunningOnIOS10OrLater()) {
+    base::scoped_nsobject<UIImpactFeedbackGenerator> generator(
+        [[UIImpactFeedbackGenerator alloc] init]);
+    [generator impactOccurred];
+  }
+}
+
+// On iOS10 and above, trigger a haptic vibration for the change in selection.
+// This is a no-op for devices that do not support it.
+- (void)triggerHapticFeedbackForSelectionChange {
+  if (base::ios::IsRunningOnIOS10OrLater()) {
+    base::scoped_nsobject<UISelectionFeedbackGenerator> generator(
+        [[UISelectionFeedbackGenerator alloc] init]);
+    [generator selectionChanged];
+  }
+}
+
 - (BOOL)isOverscrollActionEnabled {
   return _overscrollActionLock == 0 && _allowPullingActions &&
          !_isOverscrollActionsDisabledForLoading;
 }
 
 - (void)triggerActionIfNeeded {
   if ([self isOverscrollActionEnabled]) {
     const BOOL isOverscrollStateActionReady =
         self.overscrollState == OverscrollState::ACTION_READY;
     const BOOL isOverscrollActionNone =
         self.overscrollActionView.selectedAction == OverscrollAction::NONE;
 
     if ((!isOverscrollStateActionReady && _didTransitionToActionReady) ||
         (isOverscrollStateActionReady && isOverscrollActionNone)) {
       [self recordMetricForTriggeredAction:OverscrollAction::NONE];
     } else if (isOverscrollStateActionReady && !isOverscrollActionNone) {
       if (CACurrentMediaTime() - _lastScrollBeginTime >=
           kMinimumPullDurationToTriggerActionInSeconds) {
         _performingScrollViewIndependentAnimation = YES;
         [self setScrollViewContentInset:UIEdgeInsetsMake(
                                             self.initialContentInset, 0, 0, 0)];
         CGPoint contentOffset = [[self scrollView] contentOffset];
         contentOffset.y = -self.initialContentInset;
         [[self scrollView] setContentOffset:contentOffset animated:YES];
         [self.overscrollActionView displayActionAnimation];
         dispatch_async(dispatch_get_main_queue(), ^{
           [self recordMetricForTriggeredAction:self.overscrollActionView
                                                    .selectedAction];
+          [self triggerHapticFeedbackForAction];
           [self.delegate overscrollActionsController:self
                                     didTriggerAction:self.overscrollActionView
                                                          .selectedAction];
         });
       }
     }
   }
 }
 
 - (void)setOverscrollState:(OverscrollState)overscrollState {
@@ skipping 195 matching lines @@
   [self
       recordMetricForTriggeredAction:self.overscrollActionView.selectedAction];
 
   // Reset all pan gesture recognizers.
   _allowPullingActions = NO;
   _panGestureRecognizer.enabled = NO;
   _panGestureRecognizer.enabled = YES;
   [self scrollView].panGestureRecognizer.enabled = NO;
   [self scrollView].panGestureRecognizer.enabled = YES;
   [self startBounceWithInitialVelocity:CGPointZero];
+
+  [self triggerHapticFeedbackForAction];
   [self.delegate
       overscrollActionsController:self
                  didTriggerAction:self.overscrollActionView.selectedAction];
 }
 
+- (void)overscrollActionsView:(OverscrollActionsView*)view
+      selectedActionDidChange:(OverscrollAction)newAction {
+  [self triggerHapticFeedbackForSelectionChange];
+}
+
 @end