The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c6c0557b00447a5f2044cf03c384d29797578f0f

commit c6c0557b00447a5f2044cf03c384d29797578f0f
Author: Alex Newcomer <newcomer@chromium.org>
Date: Mon Apr 09 22:11:22 2018

cros: Dismiss AppList when a tap or click reaches an empty area

The old AppList behavior dismissed the Applist when a tap or click was
not within the AppsGridView bounds. Instead we would like to dismiss the
AppList if a tap or click lands on an empty region.

Bug:  829473 
Change-Id: Iafa4753f917aef6839b151e83b314a6b036dc906
Reviewed-on: https://chromium-review.googlesource.com/998521
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549296}
[modify] https://crrev.com/c6c0557b00447a5f2044cf03c384d29797578f0f/ui/app_list/views/app_list_view.cc
[modify] https://crrev.com/c6c0557b00447a5f2044cf03c384d29797578f0f/ui/app_list/views/app_list_view_unittest.cc
[modify] https://crrev.com/c6c0557b00447a5f2044cf03c384d29797578f0f/ui/app_list/views/apps_grid_view.cc
[modify] https://crrev.com/c6c0557b00447a5f2044cf03c384d29797578f0f/ui/app_list/views/apps_grid_view.h