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This CL is adding unittests for ELIDE_HEAD text eliding.

The test coverage of this eliding mode is low and we want to increase
it before trying to refactor the code.

This CL has no behavior changes.

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

Bug: 1085014
Change-Id: I7f84fba3c558fcf2fa63a9f07fa0e0270ce7d121
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522918
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825969}