GitLab

The original cl is reviewed here:
https://chromium-review.googlesource.com/c/chromium/src/+/1251901

The reland calls waitForCompositorCommit before starting the test to make
sure that the compositor is ready.

To Sheriffs:
Please update the test expectations in case of a flaky test instead of
reverting this cl since I need to convert middleClickAutoscroll
tests to use gpuBenchmarking to land the fix for autoscroll coordinates:
https://chromium-review.googlesource.com/c/chromium/src/+/1239174
GpuBenchmarking makes the tests prone to flakiness, input team will work
on the flakiness of the tests using gpu benchmarking in Q4.

Bug: 875945
Change-Id: Ic722fbd8a08bee7bc1e51143ae9a6cb738807fe7
Reviewed-on: https://chromium-review.googlesource.com/c/1277806Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Sahel Sharify <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599319}