GitLab

This CL records the user actions:
* Signin_Impression_FromAvatarBubbleSignin.
* Signin_Impression{With|No}Account_FromAvatarBubbleSignin

Bug: 819432
Change-Id: Ica6334eb9fbe63ed9db285379095d7a5613b4370
Reviewed-on: https://chromium-review.googlesource.com/1007442Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550613}