GitLab

Add user actions for:
- The menu being opened
- The pin button being pressed
- The user activating an extension from the menu
- The user activating an extension from the toolbar

Bug: 1064111
Change-Id: I6978c1ffefcbb4171e756375e9bc9798d2674be6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116583Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754805}