RFR: 8266846: Add java.time.InstantSource [v3]

[Stephen Colebourne]

> 8266846: Add java.time.InstantSource

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

  8266846: Add java.time.InstantSource

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4016/files
  - new: https://git.openjdk.java.net/jdk/pull/4016/files/7fa9d0ec..425e01a8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4016&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4016&range=01-02

  Stats: 12 lines in 3 files changed: 1 ins; 3 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4016.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4016/head:pull/4016

PR: https://git.openjdk.java.net/jdk/pull/4016