RFR: 8284638: store skip buffers in InputStream Object [v12]

[XenoAmess]

> @jmehrens what about this then?
> I think it safe now(actually this mechanism is learned from Reader)

XenoAmess has updated the pull request incrementally with one additional commit since the last revision:

  add documents

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5872/files
  - new: https://git.openjdk.java.net/jdk/pull/5872/files/47d8e195..fbc24743

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=11
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=10-11

  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5872.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5872/head:pull/5872

PR: https://git.openjdk.java.net/jdk/pull/5872