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This is guarded behind a feature flag. Ideally, we should be able to
check whether a launch URL works offline before registering the content
index entry.

Bug: 1122646
Change-Id: I204828691590670f3625eb02b53c1bb6dbbc574a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379836
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814287}