GitLab

Background:
Two times of continuous swipe up from bezel breaks scroll event in app
list because second scroll begin event will be consumed by shelf layout
manager, which makes subsequent scroll events go into shelf layout
manager instead of app list.

Changes:
Avoid consuming the scroll event when launcher is visible.

Bug: 896934
Change-Id: I46c9ad8f43a15160b890e5a6d4485dbb3e6bed3d
Reviewed-on: https://chromium-review.googlesource.com/c/1291788Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601237}