Add callstats.py run --refresh flag

Add callstats.py run --refresh flag

This flag forces the page to (soft) refresh a given number of times for
each iteration.  The statistics of all refreshes are collected in the
same file.

R=cbruni@chromium.org, mvstanton@chromium.org
BUG=
LOG=N

Committed: https://crrev.com/8f6556bd1963c1192ebd083ddeb34e867b0a561e
Cr-Commit-Position: refs/heads/master@{#36214}

[nickie, 2016-05-11 14:22:39]

So far, it's not easy to distinguish between the statistics from different
refreshes.  In simple cases, there will just be one set of stats per refresh;
however, pages that redirect will have more sets per refresh.  (Even adding a
banner in between is not so easy...)  Also, we need to think what will go in the
json file, in the case of refreshes.

I think it's good enough for beta testing.  You will also need
https://codereview.appspot.com/297250043 for trying it.

[Camillo Bruni, 2016-05-11 14:34:59]

lgtm

[nickie, 2016-05-11 16:39:34]

In the files with the statistics we now have "STATS" lines that mark each
refresh.
The first run is marked with "(0)", the first refresh with "(1)", etc.

[mvstanton, 2016-05-12 14:27:36]

LGTM, thanks Nikolaus!

[nickie, 2016-05-12 15:14:03]

The CQ bit was checked by nikolaos@chromium.org

[nickie, 2016-05-12 15:14:04]

The patchset sent to the CQ was uploaded after l-g-t-m from cbruni@chromium.org,
mvstanton@chromium.org
Link to the patchset: https://codereview.chromium.org/1967123002/#ps60001
(title: "Add exponential timeout in failed retries")

[commit-bot: I haz the power, 2016-05-12 15:14:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1967123002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1967123002/60001

[commit-bot: I haz the power, 2016-05-12 15:15:19]

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

[commit-bot: I haz the power, 2016-05-12 15:15:20]

Try jobs failed on following builders:
  v8_linux_arm64_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel_ng/build...)
  v8_linux_arm_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel_ng/builds/...)
  v8_linux_dbg_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng/builds/5697)
  v8_linux_gcc_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/bu...)
  v8_linux_mips64el_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mips64el_compile_r...)
  v8_linux_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng/builds/5673)
  v8_mac_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/1572)
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/15158)

[nickie, 2016-05-12 15:19:12]

The CQ bit was checked by nikolaos@chromium.org

[nickie, 2016-05-12 15:19:12]

The patchset sent to the CQ was uploaded after l-g-t-m from
mvstanton@chromium.org, cbruni@chromium.org
Link to the patchset: https://codereview.chromium.org/1967123002/#ps80001
(title: "Rebase")

[commit-bot: I haz the power, 2016-05-12 15:19:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1967123002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1967123002/80001

[commit-bot: I haz the power, 2016-05-12 15:53:42]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2016-05-12 15:55:59]

Description was changed from

==========
Add callstats.py run --refresh flag

This flag forces the page to (soft) refresh a given number of times for
each iteration.  The statistics of all refreshes are collected in the
same file.

R=cbruni@chromium.org, mvstanton@chromium.org
BUG=
LOG=N
==========

to

==========
Add callstats.py run --refresh flag

This flag forces the page to (soft) refresh a given number of times for
each iteration.  The statistics of all refreshes are collected in the
same file.

R=cbruni@chromium.org, mvstanton@chromium.org
BUG=
LOG=N

Committed: https://crrev.com/8f6556bd1963c1192ebd083ddeb34e867b0a561e
Cr-Commit-Position: refs/heads/master@{#36214}
==========

[commit-bot: I haz the power, 2016-05-12 15:56:00]

Patchset 5 (id:??) landed as
https://crrev.com/8f6556bd1963c1192ebd083ddeb34e867b0a561e
Cr-Commit-Position: refs/heads/master@{#36214}