blink/bindings: Wait for ThreadTicks initialization in tests.

This is the likely cause for this revert:
https://chromium-review.googlesource.com/c/chromium/src/+/1574286

If true, then the culprit CL only triggered the issue by accident.

Bug: 924164
Change-Id: I8261f20e91fbcdf7284b17630bad25f19176ff60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577423
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653114}
1 file changed