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These classes are meant to be extended, but the test runner
tries to run them anyway which causes a warning message to
surfaced as a test result. Making them abstract allows
them to be used by subclasses.

bug: 28503384
Change-Id: I45c34dde7f045aa6721352508df463c69c2cd8ef

Based on openJdk 8u60 source & iam@ stream prototype in
ag/872080

Uncommented all code that was waiting for java.util.stream
to show up

Differences from original sources:
- Removed unsignedDivision usage from LongStream, it's not currently
supported and we don't expect that large workloads on mobile devices.
- Removed java.nio.file references.
- Removed (yet) not implemented stream-related methods from
other packages listed in package-info.java.

Bug: 27692239
Change-Id: Ie24e60e8248367b576ef91046837ccde152de373
(cherry picked from commit d0a2645e)

Second attempt, in frist one I've submitted some code from openJdk 1.9
that shouldn't be here, orignial change can be found at
5328e07d

Adapted from sources taken from CVS using:
cvs -d ':pserver:anonymous@gee.cs.oswego.edu/home/jsr166/jsr166' checkout -D "03/03/2016 10:00:00 GMT" jsr166

This time with hidden/removed "@since 9" methods and classes

Bug: 27426599
Change-Id: Ibd8d26e13cba091bfd983c73d005e4f8d8f5946d
(cherry picked from commit b8b75116)