hg: jdk/sandbox: 8139206: Add InputStream readNBytes(int len)

[chris.hegarty at oracle.com]

Changeset: 917868f73209
Author:    bpb
Date:      2018-02-01 09:40 -0800
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/917868f73209

8139206: Add InputStream readNBytes(int len)
Reviewed-by: alanb, chegar, plevart, apetcher, rriggs, weijun

! src/java.base/share/classes/java/io/InputStream.java
! test/jdk/java/io/InputStream/NullInputStream.java
! test/jdk/java/io/InputStream/ReadNBytes.java