[tools] Support custom script injection for callstats.py

[tools] Support custom script injection for callstats.py

This is a poor-man's solution to trigger page interactions.

BUG=

Committed: https://crrev.com/e2effcbc35e4dbea8cd8e2c4b42149aa0ade0e36
Cr-Commit-Position: refs/heads/master@{#40604}

[Camillo Bruni, 2016-10-26 15:08:54]

cbruni@chromium.org changed reviewers:
+ jochen@chromium.org

[Camillo Bruni, 2016-10-26 15:08:54]

PTAL

[jochen (gone - plz use gerrit), 2016-10-26 15:13:21]

lgtm

[Camillo Bruni, 2016-10-26 18:49:19]

The CQ bit was checked by cbruni@chromium.org

[commit-bot: I haz the power, 2016-10-26 18:49:34]

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, 2016-10-26 19:15:03]

Committed patchset #1 (id:1)

[Camillo Bruni, 2016-11-02 20:15:04]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2464053005/ by cbruni@chromium.org.

The reason for reverting is: speculative revert to address regressions on
cnn.com benchmark..

[commit-bot: I haz the power, 2016-11-17 22:14:41]

Description was changed from

==========
[tools] Support custom script injection for callstats.py

This is a poor-man's solution to trigger page interactions.

BUG=
==========

to

==========
[tools] Support custom script injection for callstats.py

This is a poor-man's solution to trigger page interactions.

BUG=

Committed: https://crrev.com/e2effcbc35e4dbea8cd8e2c4b42149aa0ade0e36
Cr-Commit-Position: refs/heads/master@{#40604}
==========

[commit-bot: I haz the power, 2016-11-17 22:14:44]

Patchset 1 (id:??) landed as
https://crrev.com/e2effcbc35e4dbea8cd8e2c4b42149aa0ade0e36
Cr-Commit-Position: refs/heads/master@{#40604}