GitLab

Add an enum for the origin of the toggle action.
Add collapse for gestures.
Modify closing mode to be on a timer for gestures.

Bug: 2386555
Change-Id: I308a8e88c1c6b27e03be0783489d5c44686184a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429445
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Connie Wan <connily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810488}