GitLab

Add a boolean metric MediaRouter.Sink.SearchOutcome, which records
whether or not a sink was found for the ID that the user entered and
attempted to cast to.

Bug: 867086
Change-Id: Ie1bf8072b7700298b8a783480b05a2e845666946
Reviewed-on: https://chromium-review.googlesource.com/1148956Reviewed-by: Derek Cheng <imcheng@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578721}