GitLab

These tests iterate over 10000 frames, and with debug mode
being 13+ times slower than release mode, this ends up taking
too long. Hopefully we won't loose much coverage by reducing
the number of iterations in debug mode.

BUG=448035, 448511

Review URL: https://codereview.chromium.org/832293003

Cr-Commit-Position: refs/heads/master@{#311512}