Add a few UMA histograms for the notification database.
commit9684384a5c73aaacf640d565039ad7357ee6d8da
authorpeter <peter@chromium.org>
Wed, 1 Apr 2015 17:23:53 +0000 (1 10:23 -0700)
committerCommit bot <commit-bot@chromium.org>
Wed, 1 Apr 2015 17:24:47 +0000 (1 17:24 +0000)
tree878f32cfcd64bb548ef880ecdaa34c9577b81267
parent173e3a4aeb9e5393edc15a3e8795b5683e8355a3
Add a few UMA histograms for the notification database.

This will give us insight in how the datbaase is performing. These
histograms will only trigger for websites that actually use persistent
Web Notifications.

BUG=447628

Review URL: https://codereview.chromium.org/1012683002

Cr-Commit-Position: refs/heads/master@{#323273}
content/browser/notifications/notification_database.h
content/browser/notifications/platform_notification_context_impl.cc
tools/metrics/histograms/histograms.xml