Added a use counter for in-body external stylesheets

Added a use counter for in-body external stylesheets

This will give us an idea for how common it is to have in-body external
stylesheets and gauge the impact of making them not block paint or
determine if we need stronger protection like blocking the HTML parser.

BUG=481122, 638074
Committed: https://crrev.com/d9d7833ff2b2d90cb54bd5cd184c00c58e2ac787
Cr-Commit-Position: refs/heads/master@{#415792}

[Pat Meenan, 2016-08-26 17:06:32]

pmeenan@chromium.org changed reviewers:
+ esprehn@chromium.org, mkwst@chromium.org

[Pat Meenan, 2016-08-26 17:06:33]

esprehn@chromium.org: PTAL

mkwst@chromium.org: Please review changes in histograms.xml

[esprehn, 2016-08-30 21:27:38]

lgtm

[Mike West, 2016-08-31 13:16:40]

LGTM.

[Pat Meenan, 2016-08-31 14:16:31]

Patchset #3 (id:40001) has been deleted

[Pat Meenan, 2016-08-31 14:17:57]

The CQ bit was checked by pmeenan@chromium.org

[Pat Meenan, 2016-08-31 14:17:58]

The patchset sent to the CQ was uploaded after l-g-t-m from
esprehn@chromium.org, mkwst@chromium.org
Link to the patchset: https://codereview.chromium.org/2286793002/#ps20001
(title: "Merge with master (feature number collided)")

[commit-bot: I haz the power, 2016-08-31 14:18:14]

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, 2016-08-31 15:08:55]

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

[commit-bot: I haz the power, 2016-08-31 15:08:56]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_arm6...)

[Pat Meenan, 2016-08-31 19:23:06]

The CQ bit was checked by pmeenan@chromium.org

[Pat Meenan, 2016-08-31 19:23:07]

The patchset sent to the CQ was uploaded after l-g-t-m from
esprehn@chromium.org, mkwst@chromium.org
Link to the patchset: https://codereview.chromium.org/2286793002/#ps60001
(title: "Fixed trivial unit test link issue (symbol export)")

[commit-bot: I haz the power, 2016-08-31 19:23:29]

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, 2016-08-31 19:26:46]

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

[commit-bot: I haz the power, 2016-08-31 19:26:50]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_arm6...)
  chromium_presubmit on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_chromeos_compile_dbg_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_clobber_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  ios-device on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)
  mac_chromium_compile_dbg_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Pat Meenan, 2016-08-31 20:02:10]

Patchset #4 (id:80001) has been deleted

[Pat Meenan, 2016-08-31 21:04:50]

The CQ bit was checked by pmeenan@chromium.org

[Pat Meenan, 2016-08-31 21:04:50]

The patchset sent to the CQ was uploaded after l-g-t-m from
esprehn@chromium.org, mkwst@chromium.org
Link to the patchset: https://codereview.chromium.org/2286793002/#ps100001
(title: "Merge to master (feature enum collision again)")

[commit-bot: I haz the power, 2016-08-31 21:05:24]

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, 2016-08-31 23:03:55]

Committed patchset #4 (id:100001)

[commit-bot: I haz the power, 2016-08-31 23:05:19]

Description was changed from

==========
Added a use counter for in-body external stylesheets

This will give us an idea for how common it is to have in-body external
stylesheets and gauge the impact of making them not block paint or
determine if we need stronger protection like blocking the HTML parser.

BUG=481122, 638074
==========

to

==========
Added a use counter for in-body external stylesheets

This will give us an idea for how common it is to have in-body external
stylesheets and gauge the impact of making them not block paint or
determine if we need stronger protection like blocking the HTML parser.

BUG=481122, 638074

Committed: https://crrev.com/d9d7833ff2b2d90cb54bd5cd184c00c58e2ac787
Cr-Commit-Position: refs/heads/master@{#415792}
==========

[commit-bot: I haz the power, 2016-08-31 23:05:21]

Patchset 4 (id:??) landed as
https://crrev.com/d9d7833ff2b2d90cb54bd5cd184c00c58e2ac787
Cr-Commit-Position: refs/heads/master@{#415792}