Revert "Remove java.nio.channels.* classes without test coverage."

This reverts commit 624c527fb97947c4f8333f2b27c9a9306e29cd1c.

Bug: 27214236
(cherry-picked from commit b6aab19f3e925bec2f48296e9a5e906d05d96466)
Change-Id: I72f008ff427712261f604e55572a7b483d66c4f8
38 files changed