ash: Add UMA action metrics for Ctrl-Shift-Q

ash: Add UMA action metrics for Ctrl-Shift-Q

BUG=none
TEST=uma.googleplex.com gains a user action entry from Accel_Exit_First_Q and Accel_Exit_Second_Q
R=sschmitz@chromium.org
TBR=sschmitz@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=202421

[James Cook, 2013-05-25 13:23:02]

PTAL - This should give us some idea about how often people only hit
Ctrl-Shift-Q once.

[James Cook, 2013-05-27 11:45:59]

On 2013/05/25 13:23:02, James Cook (Chromium) wrote:
> PTAL - This should give us some idea about how often people only hit
> Ctrl-Shift-Q once.

TBR-ing to get this in for next canary/dev

[commit-bot: I haz the power, 2013-05-27 11:46:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamescook@chromium.org/15841006/1

[commit-bot: I haz the power, 2013-05-27 14:23:56]

Change committed as 202421

[jar (doing other things), 2013-05-27 16:57:46]

Please add changes for tools/metrics/histograms/histograms.xml.  

It is helpful for to have both together when we need to look closer. Alexei can
help with that review.

[James Cook, 2013-05-28 15:40:48]

jar/alexei - I'm planning to compare this keyboard shortcut to other keyboard
shortcuts like Accel_LockScreen_L and Accel_NextWindow_Tab. These are only
recorded as user actions, not as UMA histograms.

Are you suggesting that in addition to user actions I add UMA histograms for
counts of shortcut presses?  Is there an example you suggest I follow?

[Alexei Svitkine (slow), 2013-05-28 15:47:27]

This is fine.

Since these are UMA actions and not histograms, no changes to histograms.xml are
necessary.

lgtm