+1 if this check can be implemented in telemetry core

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/95e17ac4602dc38aaa6a44d4f6d2566920d6c75d

commit 95e17ac4602dc38aaa6a44d4f6d2566920d6c75d
Author: ulan <ulan@chromium.org>
Date: Fri Apr 07 09:00:03 2017

Ensure fixed amount of scrolling in infinite scroll stories.

This patch changes the scrolling logic in the stories such that each
story does the same fixed amount of scrolling in any run.

Apart from that the stories are refactored and unified following the
convention of the system health stories.

PERF SHERIFF NOTE: expect regressions and/or improvements in
- v8.infinite_scroll_tbmv2 (and other variants of this benchmark).
- v8.mobile_infinite_scroll_tbmv2 (and other variants of this benchmark).

BUG= chromium:704124 

Review-Url: https://codereview.chromium.org/2773483002
Cr-Commit-Position: refs/heads/master@{#462813}

[modify] https://crrev.com/95e17ac4602dc38aaa6a44d4f6d2566920d6c75d/tools/perf/benchmarks/v8.py
[modify] https://crrev.com/95e17ac4602dc38aaa6a44d4f6d2566920d6c75d/tools/perf/page_sets/infinite_scroll_cases.py
[delete] https://crrev.com/b63a4f94ae3e6b72ed0107f5525cc48615a0e118/tools/perf/page_sets/mobile_infinite_scroll_cases.py