GitLab

Update WebAppMetrics histograms when the kDesktopPWAsWithoutExtensions
feature is enabled, and a web app launches.

Not yet updating: histograms indicating if an app was installed by the
user.

Bug: 918986
Change-Id: I66b356776b7de5d6c6156517777b92e56dbd92a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846625
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705783}