Add script injection when replaying with callstats.py

Add script injection when replaying with callstats.py

This allows benchmarking without --single-process and correctly
gathering --runtime-call-stats numbers.

Add optional parameter to %GetAndResetRuntimeCallStats

-  Without any parameter, it returns a string with the runtime call
   statistics (as before).
-  With one string parameter, it appends the statistics to the file with
   that file name.
-  With one integer parameter (which must be 1=stdout or 2=stderr), it
   prints the statistics to the output with of that file descriptor.

The injected script is automatically generated.
Also, callstats.py does not have a hardwired DEFAULT_SITES anymore.

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

Committed: https://crrev.com/5fa1c61ee0babe9e4c3b2fa0069912e6d42ee2dc
Cr-Commit-Position: refs/heads/master@{#36172}

[nickie, 2016-05-11 11:45:59]

For injection to work properly for sites with strict content security policy
(like twitter.com), see:
https://codereview.appspot.com/297250043/

[Camillo Bruni, 2016-05-11 11:50:24]

lgtm

[nickie, 2016-05-11 11:51:14]

The CQ bit was checked by nikolaos@chromium.org

[commit-bot: I haz the power, 2016-05-11 11:51:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1966193002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1966193002/1

[commit-bot: I haz the power, 2016-05-11 12:23:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-11 12:24:42]

Description was changed from

==========
Add script injection when replaying with callstats.py

This allows benchmarking without --single-process and correctly
gathering --runtime-call-stats numbers.

Add optional parameter to %GetAndResetRuntimeCallStats

-  Without any parameter, it returns a string with the runtime call
   statistics (as before).
-  With one string parameter, it appends the statistics to the file with
   that file name.
-  With one integer parameter (which must be 1=stdout or 2=stderr), it
   prints the statistics to the output with of that file descriptor.

The injected script is automatically generated.
Also, callstats.py does not have a hardwired DEFAULT_SITES anymore.

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

to

==========
Add script injection when replaying with callstats.py

This allows benchmarking without --single-process and correctly
gathering --runtime-call-stats numbers.

Add optional parameter to %GetAndResetRuntimeCallStats

-  Without any parameter, it returns a string with the runtime call
   statistics (as before).
-  With one string parameter, it appends the statistics to the file with
   that file name.
-  With one integer parameter (which must be 1=stdout or 2=stderr), it
   prints the statistics to the output with of that file descriptor.

The injected script is automatically generated.
Also, callstats.py does not have a hardwired DEFAULT_SITES anymore.

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

Committed: https://crrev.com/5fa1c61ee0babe9e4c3b2fa0069912e6d42ee2dc
Cr-Commit-Position: refs/heads/master@{#36172}
==========

[commit-bot: I haz the power, 2016-05-11 12:24:42]

Patchset 1 (id:??) landed as
https://crrev.com/5fa1c61ee0babe9e4c3b2fa0069912e6d42ee2dc
Cr-Commit-Position: refs/heads/master@{#36172}