Added documentation on perf waterfall.

Added documentation on perf waterfall.

TBR=nednguyen@google.com

Review-Url: https://codereview.chromium.org/2945603003
Cr-Commit-Position: refs/heads/master@{#480260}
Committed: https://chromium.googlesource.com/chromium/src/+/d37f9c55dfda7383cffd5eb2d7ee804505ef94cd

[sullivan, 2017-06-17 01:12:10]

Description was changed from

==========
Added documentation on perf waterfall.
==========

to

==========
Added documentation on perf waterfall.

TBR=nednguyen@google.com
==========

[sullivan, 2017-06-17 01:13:06]

The CQ bit was checked by sullivan@chromium.org

[commit-bot: I haz the power, 2017-06-17 01:13:29]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-17 01:25:52]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1497661986121820, "parent_rev":
"7f8e2395893e878ef27ae38f02deaf5a13250733", "commit_rev":
"d37f9c55dfda7383cffd5eb2d7ee804505ef94cd"}

[commit-bot: I haz the power, 2017-06-17 01:26:04]

Description was changed from

==========
Added documentation on perf waterfall.

TBR=nednguyen@google.com
==========

to

==========
Added documentation on perf waterfall.

TBR=nednguyen@google.com

Review-Url: https://codereview.chromium.org/2945603003
Cr-Commit-Position: refs/heads/master@{#480260}
Committed:
https://chromium.googlesource.com/chromium/src/+/d37f9c55dfda7383cffd5eb2d7ee...
==========

[commit-bot: I haz the power, 2017-06-17 01:26:05]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/d37f9c55dfda7383cffd5eb2d7ee...