Added Ash.NumberOfVisibleWindows UMA statistic to track the number of visible
commit32afefd3f43e4548902826b0705be74f31d58c5b
authorbruthig <bruthig@chromium.org>
Wed, 1 Apr 2015 23:36:12 +0000 (1 16:36 -0700)
committerCommit bot <commit-bot@chromium.org>
Wed, 1 Apr 2015 23:36:46 +0000 (1 23:36 +0000)
treeec3dd9bab9f1b6933fe320fa8a0828e814511f3c
parenta500a0fbbfbaac5ddf2f58d52be34a4d1df03f91
Added Ash.NumberOfVisibleWindows UMA statistic to track the number of visible
windows in the primary root window.

In order to determine whether adding new window management would be useful we
want to know how many windows users generally interact with.

TEST=Manually verified the number of visible windows reported when
adding/removing/minimizing/maximizing/fullscreening windows in the different
containers.

BUG=470304

Review URL: https://codereview.chromium.org/1047803003

Cr-Commit-Position: refs/heads/master@{#323369}
ash/metrics/user_metrics_recorder.cc
tools/metrics/histograms/histograms.xml