RFR 8134255: Implement tab-completion for java package prefixes and package names

[Michael Haupt]

Hi Sundar,

> Am 22.08.2015 um 00:38 schrieb Sundararajan Athijegannathan <sundararajan.athijegannathan at oracle.com>:
> Please review http://cr.openjdk.java.net/~sundar/8134255/ for https://bugs.openjdk.java.net/browse/JDK-8134255


lower-case thumbs up. This is great.

Nits:
* PackagesHelper.java:102, @paraam -> @param
* PackagesHelper.java:136, some arguments missing final

Best,

Michael

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