RFR: 8279283 - (ch) BufferedInputStream should override transferTo

[Markus KARG]

Implementation of JDK-8279283

-------------

Commit messages:
 - BufferedInputStream::transferTo

Changes: https://git.openjdk.java.net/jdk/pull/6935/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6935&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279283
  Stats: 15 lines in 1 file changed: 15 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6935.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6935/head:pull/6935

PR: https://git.openjdk.java.net/jdk/pull/6935