RFR: JDK-8275406: Add copy-to-clipboard feature to snippet UI [v2]

[Hannes Wallnöfer]

> Please review a change to add a copy-to-clipboard feature to snippets. I took special care to make the feature usable on mobile devices. Sample output can be viewed and tested here:
> 
> http://cr.openjdk.java.net/~hannesw/8275406/api.00/java.base/java/lang/Throwable.html#printStackTrace()

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

  Update copyright years

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6011/files
  - new: https://git.openjdk.java.net/jdk/pull/6011/files/8aa62cd9..b4c327c9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6011&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6011&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6011.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6011/head:pull/6011

PR: https://git.openjdk.java.net/jdk/pull/6011