Add Histogram record to SadTabGtk

Add Histogram to SadTabGtk

BUG=NONE
TEST=Compiles and test chrome://histograms/Tabs.SadTab


Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=175490

[simonhong_, 2013-01-06 05:00:18]

Dear Elliot
Please review this patch.
Thank you.

[Elliot Glaysher, 2013-01-07 18:10:12]

+jamescook who added the histograms to views.

James, do we want these on gtk too? Also, these are different count types. Is
that ok?

[James Cook, 2013-01-07 18:27:51]

LGTM. This might be useful on GTK as it will give us more insight into how often
a user actually sees an "Aw Snap" page.  The UMA macros for counts look correct.
 In the views case we were running some experiments on Chrome OS that lead us to
use EXPERIMENT_CUSTOM_COUNTS instead of UMA_HISTOGRAM_CUSTOM_COUNTS.

[Elliot Glaysher, 2013-01-07 18:33:40]

On 2013/01/07 18:27:51, James Cook (Chromium) wrote:
> LGTM. This might be useful on GTK as it will give us more insight into how
often
> a user actually sees an "Aw Snap" page.  The UMA macros for counts look
correct.
>  In the views case we were running some experiments on Chrome OS that lead us
to
> use EXPERIMENT_CUSTOM_COUNTS instead of UMA_HISTOGRAM_CUSTOM_COUNTS.

then lgtm2.

[commit-bot: I haz the power, 2013-01-07 21:30:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/simon.hong81@gmail.com/11775012/1

[commit-bot: I haz the power, 2013-01-08 00:00:06]

Retried try job too often on win_aura for step(s) interactive_ui_tests

[commit-bot: I haz the power, 2013-01-08 04:03:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/simon.hong81@gmail.com/11775012/1

[commit-bot: I haz the power, 2013-01-08 06:09:57]

Change committed as 175490