I am not completely sure about the original purpose of the haptic feedback, which was added 4 months ago in https://codereview.chromium.org/2724233003 ( bug 696634 ).

There the feedback was meant to be tied to MDCSnackbarMessageAction, which is the copy toast. If that's the property we want to keep, then I should just add it to the other copy actions, contradicting the most recent guidance from Pete.

An alternative is to not tie it to Copy and instead to the reauth, which is the current content of https://chromium-review.googlesource.com/c/567152/.

I'm Cc-ing both pschaffner@ and pink@ who might have opinions.

P.S. I tried to enable the haptic feedback on my test iPhone 5s, but that seems to be too old for that. Is there a way to enable it there?

This has been clarified in a discussion on https://chromium-review.googlesource.com/c/567152 and the goal is now to add haptic feedback to the copy operations for site and username as well.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5201a681d04dc0fefdfca0b1eca8b3df2e40c9eb

commit 5201a681d04dc0fefdfca0b1eca8b3df2e40c9eb
Author: Vaclav Brozek <vabr@chromium.org>
Date: Wed Jul 12 21:50:41 2017

[iOS passwords settings] Tie haptic feedback to all copy toasts

Currently, in passwords settings, haptic feedback is given during copying
password but not during copying any of the other less sensitive data (site
and username).

 https://crbug.com/696634  hints at, and pinkerton@ confirmed, that the idea
for haptic feedback was to accompany all MD toasts in the UI. pschaffner@
confirmed on this CL that that's a good idea for the passwords settings
as well.

Therefore, this CL adds the haptic feedback to the site and username
copy toasts. Those copies always succeed, because there is no
reauthentication to be done, so the feedback is always a successful
one.

Bug:  740948 
Change-Id: Ie282499eb5095cabeb4d8349f6231ae653f01f6a
Reviewed-on: https://chromium-review.googlesource.com/567152
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486107}
[modify] https://crrev.com/5201a681d04dc0fefdfca0b1eca8b3df2e40c9eb/ios/chrome/browser/ui/settings/password_details_collection_view_controller.mm

The haptic feedback should now happen on every copy action in the password settings. My device (iPhone 5S) does not seem to have any haptic abilities, so I cannot test. If anyone finds more issues (starting with tomorrow's canary), please let me know.

It requires an iPhone7 or better to be able to test. 

To clarify, we added haptics for HUD display throughout the app, and copying passwords show a HUD, thus the feedback. 

Verified (#3) on iOS 10.3.3, 11.0 on iPhone 6 +, iPhone 7+, iPad Pro 12'5 on build 62.0.3202.29 Beta.