Merge "Make libfutures_channel available to DnsResolver" am: 196b0d2718 am: 53f76e6588

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-channel/+/1741281

Change-Id: If018cf1d29184d8f2be9951ebcf87eaa96f721f3