GitLab

Add browser tests for AppLaunchHandler to verify the restoration
process.

BUG=1146900

Change-Id: Ibeaf262080a24c680718888ee081cc62c5b21a3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619245
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843901}