RFR: 8279283 - BufferedInputStream should override transferTo [v10]

[Markus KARG]

> Implementation of JDK-8279283

Markus KARG has updated the pull request incrementally with two additional commits since the last revision:

 - testing transferTo() when mark was set
 - testing transferTo() when buffer is non-empty

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Changes:
  - all: https://git.openjdk.org/jdk/pull/6935/files
  - new: https://git.openjdk.org/jdk/pull/6935/files/b4d5004d..ab7c170b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=6935&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=6935&range=08-09

  Stats: 20 lines in 1 file changed: 13 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/6935.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/6935/head:pull/6935

PR: https://git.openjdk.org/jdk/pull/6935