Update Locale to OpenJDK8u60, part 2

This CL adds APIs for RFC 4647 Matching of Language Tags.
Assertions in added tests are a combination of current
behavior and examples from RFC 4647.

Notes:

 * The upstream code has a bug where calling LocaleMatcher.parse()
   modifies values of static final LocaleEquivalentMaps.multiEquivsMap.
   This bug has already been reported upstream at
   https://bugs.openjdk.java.net/browse/JDK-8166994
   The upstream fix will be applied along with suitable tests in
   a follow-up CL.
 * Locale.filterTag() and Locale.lookupTag*() tends to return
   lowerCase versions of the tags supplied, except when the
   priority list of LanguageRanges contains a "*" or similar.
   For now, LocaleTest lowerCases all tags (via tagsOf()) so that
   the test can pass. I plan to submit a patch / proposal to
   upstream to preserve case of the given tags, at which point
   the test could be made more opinionated.
 * The hard coded mapping of equivalent locales in
   LocaleEquivalentMaps comes from an unknown source. It doesn't
   appear to be present in ICU so this CL is taking the upstream
   mapping for now.
 * Notwithstanding the comments above, the code added to
   Locale.java, LocaleEquivalentMaps.java and LocaleMatcher.java
   in this CL exactly matches upstream OpenJDK8u60. No attempt
   has been made to make this code cleaner / more robust in this
   CL.

Bug: 29935305
Test: cts-tradefed run cts -m CtsLibcoreTestCases -a arm64-v8a

Change-Id: Ie86477b8eea1f5f3d69d4f161628847793d372fd

0 files changed, 0 insertions, 0 deletions