RFR: 8276141: XPathFactory set/getProperty method [v3]

[Joe Wang]

> Add setProperty/getProperty methods to the XPath API so that properties can be supported in the future.

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

  drop: in the XPath API

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6215/files
  - new: https://git.openjdk.java.net/jdk/pull/6215/files/569c6cd8..52323c79

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6215&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6215&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6215.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6215/head:pull/6215

PR: https://git.openjdk.java.net/jdk/pull/6215