Chromium tests were prepared in https://codereview.chromium.org/1118743003/ and https://codereview.chromium.org/1135493002/.
Blink tests in https://codereview.chromium.org/1115193002/

LOG=Y
BUG=chromium:480652
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1127363002

Cr-Commit-Position: refs/heads/master@{#28295}