RFR: 8255878: FilterInputStream is missing implementations of Java 9 InputStream methods [v2]

[Brian Burkhalter]

> This request proposes to modify `java.io.FilterInputStream` to override `readAllBytes()`, `readNBytes(int)`, `skipNBytes(long)`, and `transferTo(OutputStream)` in order to leverage any performance advantage that the wrapped stream might have over the `java.io.InputStream` implementations of these methods.

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

  8255878: Add @implSpec where appropriate

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5367/files
  - new: https://git.openjdk.java.net/jdk/pull/5367/files/ceed73ac..3064baee

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5367&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5367&range=00-01

  Stats: 31 lines in 1 file changed: 13 ins; 3 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5367.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5367/head:pull/5367

PR: https://git.openjdk.java.net/jdk/pull/5367