GitLab

Log the index activated in the multipaste menu. Will be used
to help UX determine if we should show more items in the menu.

Bug: 1099338
Change-Id: I28533ed7628fe54fde2e182e76ab5f6466d3b1f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427406
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812387}