CrOS Shelf: Fix RTL drag gesture

Before this CL, given the reverse X coordinates in RTL, a drag towards
one direction would cause the dragged view to move in the opposite
direction.

Bug: 913092
Change-Id: I7454d9161d91d459cedcccd1e8da0a2b10918655
Reviewed-on: https://chromium-review.googlesource.com/c/1373452
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616730}
1 file changed