GitLab

- introduces the metric of whether manual or automatic generation was triggered
- fixes a bug in reporting NO_SIGN_UP_DETECTED and SIGN_UP_DETECTED
- disables reporting of PasswordGenerationEvent if generation is disabled

Bug: 851401
Change-Id: I4ccd4bfb5847d108a671571601e85fbf876de637
Reviewed-on: https://chromium-review.googlesource.com/1095177Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566794}