Add detailed use-counter stats for the prefixed quota APIs

Add detailed use-counter stats for the prefixed quota APIs

The "legacy" prefixed quota APIs have ridiculously high usage counts:

The oldest one window.webkitStorageInfo tracked as PrefixedStorageInfo
has 0.07% of page loads which is crazy high...

But navigator.webkitTemporaryStorage/webkitTemporaryStorage tracked
together as as PrefixedStorageQuota have 0.8% of page loads!

The counters exist on the attributes gating access, rather than the
methods themselves, so they might be getting overcounted due to
simple enumeration of the window/navigator objects.

This change adds per-method counters that will show actual usage
of the APIs so we can better plan out a deprecation strategy.

BUG=689601
R=mpearson@chromium.org,foolip@chromium.org

Review-Url: https://codereview.chromium.org/2683333002
Cr-Commit-Position: refs/heads/master@{#449685}
Committed: https://chromium.googlesource.com/chromium/src/+/b2d99c3aed47c0f159676a1fbf496e530be25885

[jsbell, 2017-02-10 01:26:12]

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

[commit-bot: I haz the power, 2017-02-10 01:26:37]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jsbell, 2017-02-10 01:37:49]

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

[jsbell, 2017-02-10 01:37:52]

mpearson@ - can you review the histograms changes and tool fix?
foolip@ - can you review the blink changes?

It looks like update_use_counter_feature_enum.py has been broken since
https://codereview.chromium.org/2586863002 since the START_MARKER regex no
longer matched.

[commit-bot: I haz the power, 2017-02-10 01:38:08]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[foolip, 2017-02-10 04:24:19]

lgtm

[Mark P, 2017-02-10 05:15:11]

metrics/ lgtm

[commit-bot: I haz the power, 2017-02-10 07:39:44]

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

[commit-bot: I haz the power, 2017-02-10 07:39:45]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_TIMED_OUT,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[jsbell, 2017-02-10 17:25:02]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2017-02-10 17:25:55]

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, 2017-02-10 19:21:35]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1486747502193040,
"parent_rev": "ca502648e278434f85f196f7211ba0e7d0130dfd", "commit_rev":
"6c4e67dd3d099fb5fd022a84a04cfb7af211dcda"}

[commit-bot: I haz the power, 2017-02-10 19:25:56]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1486747502193040,
"parent_rev": "c988ff107fbc55e2c3e64f3234f42687a5fb3e95", "commit_rev":
"b2d99c3aed47c0f159676a1fbf496e530be25885"}

[commit-bot: I haz the power, 2017-02-10 19:26:29]

Description was changed from

==========
Add detailed use-counter stats for the prefixed quota APIs

The "legacy" prefixed quota APIs have ridiculously high usage counts:

The oldest one window.webkitStorageInfo tracked as PrefixedStorageInfo
has 0.07% of page loads which is crazy high...

But navigator.webkitTemporaryStorage/webkitTemporaryStorage tracked
together as as PrefixedStorageQuota have 0.8% of page loads!

The counters exist on the attributes gating access, rather than the
methods themselves, so they might be getting overcounted due to
simple enumeration of the window/navigator objects.

This change adds per-method counters that will show actual usage
of the APIs so we can better plan out a deprecation strategy.

BUG=689601
R=mpearson@chromium.org,foolip@chromium.org
==========

to

==========
Add detailed use-counter stats for the prefixed quota APIs

The "legacy" prefixed quota APIs have ridiculously high usage counts:

The oldest one window.webkitStorageInfo tracked as PrefixedStorageInfo
has 0.07% of page loads which is crazy high...

But navigator.webkitTemporaryStorage/webkitTemporaryStorage tracked
together as as PrefixedStorageQuota have 0.8% of page loads!

The counters exist on the attributes gating access, rather than the
methods themselves, so they might be getting overcounted due to
simple enumeration of the window/navigator objects.

This change adds per-method counters that will show actual usage
of the APIs so we can better plan out a deprecation strategy.

BUG=689601
R=mpearson@chromium.org,foolip@chromium.org

Review-Url: https://codereview.chromium.org/2683333002
Cr-Commit-Position: refs/heads/master@{#449685}
Committed:
https://chromium.googlesource.com/chromium/src/+/b2d99c3aed47c0f159676a1fbf49...
==========

[commit-bot: I haz the power, 2017-02-10 19:26:30]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/b2d99c3aed47c0f159676a1fbf49...