GitLab

When reading the output of the waveshaper tests, it's kind of hard to
tell exactly what's being tested.  Add a few more test messages and/or
labels to make it a bit clearer.

Bug: 789197
Test: WaveShaper/waveshaper-{copy-curve,simple}.html
Change-Id: Ic90ebe94282d4b416321766bc16daa3cbc53299c
Reviewed-on: https://chromium-review.googlesource.com/794018
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519891}