GitLab

Start the reorder flow on dragstart instead of mousedown. This will
prevent the tile from showing its elevated state when the user clicks
it. As a side effect, the elevated state will not appear until the user
starts dragging the tile.

Screencast: https://drive.google.com/open?id=1Oy6dK-2r8TwdC1XW6ka0LRy676mpDXTG

Bug: 986741
Change-Id: Iada5fefcade302b815b9fbaf1582ae00cac57b24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717146
Auto-Submit: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680593}