Add SpellCheck.SpellingService.Enabled histogram.

Add SpellCheck.SpellingService.Enabled histogram.

Code to record stats for the SpellCheck.SpellingService.Enabled histogram
was added in https://chromiumcodereview.appspot.com/12335019/. This CL adds
the histogram to the main list of histograms so that other systems will
pick it up.

BUG=
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=226913

[groby-ooo-7-16, 2013-10-03 17:39:47]

FWIW, LGTM from me - added isherman for OWNERs review.

https://codereview.chromium.org/25752007/diff/1/tools/metrics/histograms/hist...
File tools/metrics/histograms/histograms.xml (right):

https://codereview.chromium.org/25752007/diff/1/tools/metrics/histograms/hist...
tools/metrics/histograms/histograms.xml:17360: +    Whether the user has opted
in to asking Google for spelling corrections.
nit: corrections -> correction suggestions? Or just suggestions?

https://codereview.chromium.org/25752007/diff/1/tools/metrics/histograms/hist...
tools/metrics/histograms/histograms.xml:17362: +    changed.
nit: Do we usually add explanations on when it is recorded?

[dfaden, 2013-10-03 17:59:15]

Thanks for the quick review!

https://codereview.chromium.org/25752007/diff/1/tools/metrics/histograms/hist...
File tools/metrics/histograms/histograms.xml (right):

https://codereview.chromium.org/25752007/diff/1/tools/metrics/histograms/hist...
tools/metrics/histograms/histograms.xml:17360: +    Whether the user has opted
in to asking Google for spelling corrections.
On 2013/10/03 17:39:48, groby wrote:
> nit: corrections -> correction suggestions? Or just suggestions?

Done.

https://codereview.chromium.org/25752007/diff/1/tools/metrics/histograms/hist...
tools/metrics/histograms/histograms.xml:17362: +    changed.
On 2013/10/03 17:39:48, groby wrote:
> nit: Do we usually add explanations on when it is recorded?

I notice that some of the other histograms do have this. I think it is important
to include this because it may change the interpretation of the stats.

[Ilya Sherman, 2013-10-04 00:52:49]

LGTM

[commit-bot: I haz the power, 2013-10-04 00:54:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dfaden@google.com/25752007/7001

[commit-bot: I haz the power, 2013-10-04 00:56:48]

Change committed as 226913