GitLab

Split JSONReaderTest.Reading into smaller test units.

This makes it easier to track down issues in specific areas of the
JSONParser.

Bug: 489301
Change-Id: I7946451edd2323cabc3fd31c9841a9c6834abd20
Reviewed-on: https://chromium-review.googlesource.com/1002815
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549449}