Add UMA stats for user settings

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index c5fd816d04aa3b2ab4c2fbad9fefd0501d113a92..d779527ad7214add291e4f31406a3d3837b93bcd 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -100,6 +100,9 @@ cr.define('options', function() {
             if (focusElement)
               focusElement.focus();
           }
+
+          chrome.send('coreOptionsUserMetricsAction',
+                      ['Options_ShowAdvancedSettings']);

[michaelpg, 2014/06/13 23:15:43]

Worth noting that this count will report up to 2x as many "show advanced
settings" actions as there actually are because users can hit "hide settings"
after "show settings". The actual factor is probably closer to 1.01, but could
you use the test in 97 to check whether they're being shown or hidden?

We probably only care about when they're being shown.

[stevenjb, 2014/06/16 21:58:10]

Done.

         };
       } else {
         $('advanced-settings-expander').hidden = true;