Add an AppService base::Feature

Also run clang-format on chrome_features.cc.

BUG=826982

Change-Id: I4916b2eeb226ca7e8ed1e73fe7d930b4634c08ee
Reviewed-on: https://chromium-review.googlesource.com/c/1336950
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608571}
3 files changed