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This CL is adding code coverage with unittests for whitespace elision.

The intend is to ensure the code semantic stay the same while doing
the eliding refactoring.

R=gab@chromium.org,msw@chromium.org

Bug: 1085014
Change-Id: I8a092e8d2c15449e80ba0508c854aca71dd7892d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533533
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827860}