Record the data use of service worker initiated requests

Record the data use of service worker initiated requests

BUG=673820

[Raj, 2017-03-20 04:42:29]

The CQ bit was checked by rajendrant@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-20 04:42:41]

Dry run: 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, 2017-03-20 04:49:21]

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

[commit-bot: I haz the power, 2017-03-20 04:49:22]

Dry run: Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Raj, 2017-03-20 18:13:09]

The CQ bit was checked by rajendrant@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-20 18:13:56]

Dry run: 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, 2017-03-20 20:41:56]

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

[commit-bot: I haz the power, 2017-03-20 20:41:57]

Dry run: This issue passed the CQ dry run.

[rajendrant, 2017-03-20 20:44:27]

rajendrant@google.com changed reviewers:
+ rajendrant@google.com, ryansturm@chromium.org

[rajendrant, 2017-03-21 15:56:35]

Will close this CL.
Will create a separate CL for recording different content::ResourceType that
will cover serviceworkers as well.