Revert 237843 "Revert 237833 "[Telemetry] Attempt to fix flaky j..."
tonyg@ says this test is just flaky, so I'm reverting the revert.
BUG=247476,323249
> Revert 237833 "[Telemetry] Attempt to fix flaky jsgamebench time..."
>
> [ RUN ] ScrollActionTest.testScrollAction
> Traceback (most recent call last):
> File "E:\b\build\slave\Win_7_Tests_x64__3_\build\src\tools\telemetry\telemetry\page\actions\scroll_unittest.py", line 66, in testScrollAction
> (scroll_position, scroll_height))
> AssertionError: scroll_position=1427; scroll_height=1429
>
> [ FAILED ] ScrollActionTest.testScrollAction (3538 ms)
>
> > [Telemetry] Attempt to fix flaky jsgamebench timeouts.
> >
> > This benchmark can take 30 mins to run, but the buildbot times out after 20 mins
> > of no output. So raise its timeout and change WaitFor to output a heartbeat so
> > that the buildbot is happy with longer timeouts.
> >
> > BUG=247476
> >
> > Review URL: https://codereview.chromium.org/
95513003
>
> TBR=tonyg@chromium.org
>
> Review URL: https://codereview.chromium.org/
95793002
TBR=dbeam@chromium.org
Review URL: https://codereview.chromium.org/
95853002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237845 0039d316-1c4b-4281-b951-d872f2087c98