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This CL adds a mojo::Remote<mojom::Logger> in CastAppDiscoveryService to
log unavailable (app_id, sink_id) pairs and socket not found errors.

Bug: 687380, b/154273698
Change-Id: Ib50c74cd9a0e66c9c05b3f36fdf653e2565d8048
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332329Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Muyao Xu <muyaoxu@google.com>
Cr-Commit-Position: refs/heads/master@{#795981}