cros: Reset the AppListView focus when it is reshown

When the top window is deactivated, the AppListView is shown without
any preparation. Fix this by resetting the focus and switching to the
first page.

Bug: 951586
Change-Id: I4a39dc503cf6cbee32cf60d29026eac10f3dc84d
Auto-Submit: Alex Newcomer <>
Reviewed-by: Xiyuan Xia <>
Commit-Queue: Alex Newcomer <>
Cr-Commit-Position: refs/heads/master@{#653651}
3 files changed