TEST_MAPPING: test dependers of this crate am: ea75c7374e am: 9f337ef3dc am: d498d7cefc

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/syn-mid/+/1488774

Change-Id: I2784eecba96a397a30d974743658cab78eeb6bfd