[iOS][Translate] Makes translate infobar language tab scroll more smoothly

- Makes it so that touches in content view won't always lead to tracking.
- Allows the scroll view to bounce.

Bug: 910994
Change-Id: I52fed1ce66a138a17feaba6109828bdeffc3d568
Reviewed-on: https://chromium-review.googlesource.com/c/1452772
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Auto-Submit: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628939}
1 file changed