Unduplicated test helper function compare_markers.

The 3 copies of compare_markers collided in jumbo builds.

Bug: 745732
Change-Id: I4363201af5e78dfa5ee59148c48d89feeeaa1a80
Reviewed-on: https://chromium-review.googlesource.com/653277
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#500918}
4 files changed