Reland "Rewrite hr-timestamp/input-events.html to a browser test"

hr-timestamp/input-events.htmlEvent timestamp tests that the received
events on the page should be equal to the timestamp provided by the
eventSender's recorded last event. But we should deprecate eventSender in
the future, and GpuBenchmarking sends events based on the current system
time, which cannot be equal to the received events' timestamp.

Some Android bots such as android-pie-x86-rel have 1 ms difference, so
I add 1 ms error.

TBR=bokan@chromium.org，majidvp@chromium.org

Bug: 1047176
Change-Id: Ie2e52d0f097aa399823208cbb5ff2df24a23c56a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314687


Reviewed-by: Lan Wei <lanwei@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791466}