[test] Let perf runner interleave try executions.

[test] Let perf runner interleave try executions.

This allows running two executables interleaved to reduce
flakiness of tryjobs. The executables must reside in
different out directories.

BUG=chromium:507213
LOG=n
NOTRY=true
TEST=python -m unittest run_perf_test

Committed: https://crrev.com/e925e0b69ffffec183083765c3b362a77ad50228
Cr-Commit-Position: refs/heads/master@{#29572}

[Michael Achenbach, 2015-07-10 10:42:47]

machenbach@chromium.org changed reviewers:
+ tandrii@chromium.org, ulan@chromium.org

[Michael Achenbach, 2015-07-10 10:45:33]

PTAL

https://codereview.chromium.org/1215273003/diff/40001/tools/unittests/run_per...
File tools/unittests/run_perf_test.py (left):

https://codereview.chromium.org/1215273003/diff/40001/tools/unittests/run_per...
tools/unittests/run_perf_test.py:414: "--arch", "android_arm"))
Unrelated fix.

[ulan, 2015-07-10 10:54:16]

lgtm

https://codereview.chromium.org/1215273003/diff/40001/tools/run_perf.py
File tools/run_perf.py (right):

https://codereview.chromium.org/1215273003/diff/40001/tools/run_perf.py#newco...
tools/run_perf.py:229: def Unchain(iterable):
This function is usually called 'unzip' as it inverts the result of the 'zip'
function.

[Michael Achenbach, 2015-07-10 13:00:20]

https://codereview.chromium.org/1215273003/diff/40001/tools/run_perf.py
File tools/run_perf.py (right):

https://codereview.chromium.org/1215273003/diff/40001/tools/run_perf.py#newco...
tools/run_perf.py:229: def Unchain(iterable):
On 2015/07/10 10:54:16, ulan wrote:
> This function is usually called 'unzip' as it inverts the result of the 'zip'
> function.

Done. Got confused...

[Michael Achenbach, 2015-07-10 13:00:33]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2015-07-10 13:00:33]

The patchset sent to the CQ was uploaded after l-g-t-m from ulan@chromium.org
Link to the patchset: https://codereview.chromium.org/1215273003/#ps60001
(title: "Review")

[commit-bot: I haz the power, 2015-07-10 13:00:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215273003/60001

[commit-bot: I haz the power, 2015-07-10 13:02:13]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-07-10 13:02:36]

Patchset 4 (id:??) landed as
https://crrev.com/e925e0b69ffffec183083765c3b362a77ad50228
Cr-Commit-Position: refs/heads/master@{#29572}