Merge "Make libfutures_channel available to DnsResolver" am: 196b0d2718 am: 53f76e6588 am: 0f3f50fac6

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

Change-Id: I84e4d27510d709204ea34e4cd671e18814884196