ServiceWorker: Move tracking code to count only pages controlled by SW

ServiceWorker: Move tracking code to count only pages controlled by SW

BUG=N/A
TEST=N/A

Committed: https://crrev.com/d8a14b38c4934f78153ee74a0a6f621a84b6017e
Cr-Commit-Position: refs/heads/master@{#294560}

[shimazu, 2014-09-12 06:20:29]

shimazu@chromium.org changed reviewers:
+ nhiroki@chromium.org

[shimazu, 2014-09-12 06:20:30]

Could you review this patch?

[nhiroki, 2014-09-12 06:26:31]

+kenjibaheux@ to CC for your information

[nhiroki, 2014-09-12 06:26:45]

LGTM, thanks!

[shimazu, 2014-09-12 07:22:57]

The CQ bit was checked by shimazu@chromium.org

[commit-bot: I haz the power, 2014-09-12 07:23:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/565843002/1

[commit-bot: I haz the power, 2014-09-12 09:31:42]

Committed patchset #1 (id:1) as d72ca31f76b253ee5d4c107be1ed003654bd308e

[commit-bot: I haz the power, 2014-09-12 09:35:53]

Patchset 1 (id:??) landed as
https://crrev.com/d8a14b38c4934f78153ee74a0a6f621a84b6017e
Cr-Commit-Position: refs/heads/master@{#294560}