GitLab

This was done previously, but the virtual/mouseevent_fractional version
was missed. Also marking them flaky only on Win 7, as per the original
report.

TBR=alexclarke@chromium.org

Bug: 784909
Change-Id: Iaa7ad21c750acedf179a9da0dcf686c65bf7300f
Reviewed-on: https://chromium-review.googlesource.com/891979Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532648}