Add a perf subdirectory under tools and a simple script to collect chromium.perf success stats.

Add a perf subdirectory under tools and a simple script to collect chromium.perf success stats.

BUG=

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=294756

[sullivan, 2015-04-03 21:49:03]

sullivan@chromium.org changed reviewers:
+ eakuefner@chromium.org, fmeawad@chromium.org, stip@chromium.org

[eakuefner, 2015-04-03 21:57:53]

lgtm

[ghost stip (do not use), 2015-04-03 22:07:18]

lgtm, but note that the infra team is moving to using
https://chromium.googlesource.com/infra/infra/+/master/ as a repository for most
new code. anything in tools/build, especially things in tools/build/, especially
scripts/tools, may not be around after a few quarters

[eakuefner, 2015-04-03 22:09:01]

The CQ bit was checked by eakuefner@chromium.org

[commit-bot: I haz the power, 2015-04-03 22:09:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1060663003/1

[commit-bot: I haz the power, 2015-04-03 22:13:26]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-03 22:13:27]

Presubmit check for 1060663003-1 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit Warnings **
License must match:
.*? Copyright (\(c\)
)?(2015|2014|2013|2012|2011|2010|2009|2008|2007|2006|2006-2008|2006-2009|2006-2010)
The Chromium Authors\. All rights reserved\.\n.*? Use of this source code is
governed by a BSD-style license that can be\n.*? found in the LICENSE file\.(?:
\*/)?\n
Found a bad license header in these files:
  build/scripts/tools/perf/chrome-perf-stats.py

Presubmit checks took 239.4s to calculate.

[sullivan, 2015-04-10 16:28:47]

The CQ bit was checked by sullivan@chromium.org

[sullivan, 2015-04-10 16:28:47]

The patchset sent to the CQ was uploaded after l-g-t-m from
eakuefner@chromium.org, stip@chromium.org
Link to the patchset: https://codereview.chromium.org/1060663003/#ps20001
(title: "Fixed copyright header")

[commit-bot: I haz the power, 2015-04-10 16:29:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1060663003/20001

[commit-bot: I haz the power, 2015-04-10 16:37:34]

Committed patchset #2 (id:20001) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=294756