Add additional stats for print preview.

Add additional stats for print preview.
Adds a new histogram that can be called from JS to record stats on the upcoming destination selector.

BUG=128275
TEST=No user visible change.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=137620

[Albert Bodenhamer, 2012-05-16 22:07:12]

I opted to constrain the UMA events we could trigger from JS.  The downside is
we have to keep the C++ and JS in sync, but it really simplifies the interaction
at the C++/JS boundary and eliminates the question of misbehaving JS code.

[Scott Byer, 2012-05-16 23:24:06]

http://codereview.chromium.org/10387162/diff/2001/chrome/browser/ui/webui/pri...
File chrome/browser/ui/webui/print_preview/print_preview_handler.cc (right):

http://codereview.chromium.org/10387162/diff/2001/chrome/browser/ui/webui/pri...
chrome/browser/ui/webui/print_preview/print_preview_handler.cc:745:
ReportUserActionHistogram(PRINT_WITH_CLOUD_PRINT);
Isn't this redundant with HandlePrintWithCloudPrint()'s reporting?

[Albert Bodenhamer, 2012-05-16 23:41:45]

On 2012/05/16 23:24:06, Scott Byer wrote:
>
http://codereview.chromium.org/10387162/diff/2001/chrome/browser/ui/webui/pri...
> File chrome/browser/ui/webui/print_preview/print_preview_handler.cc (right):
> 
>
http://codereview.chromium.org/10387162/diff/2001/chrome/browser/ui/webui/pri...
> chrome/browser/ui/webui/print_preview/print_preview_handler.cc:745:
> ReportUserActionHistogram(PRINT_WITH_CLOUD_PRINT);
> Isn't this redundant with HandlePrintWithCloudPrint()'s reporting?
HandlePrintWithCloudPrint will go away once Robert's UI changes go in.  My
intent is to repurpose its histogram value.  I'll just remove the tracking in
HandlePrintWithCloudPrint now to avoid confusion.

Done.

[Scott Byer, 2012-05-16 23:54:30]

lgtm

[commit-bot: I haz the power, 2012-05-16 23:55:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/abodenha@chromium.org/10387162/3002

[commit-bot: I haz the power, 2012-05-17 02:57:24]

Change committed as 137620