Log mixed script shield events.

chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc

Index: chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc
diff --git a/chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc b/chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc
index 1870fb1628541086df8197446b37bfe1c2472714..4da5424604e5ffa4099c835db43b50840560675d 100644
--- a/chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc
+++ b/chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/ui/browser_content_setting_bubble_model_delegate.h"
 
+#include "base/metrics/histogram.h"
+#include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
@@ -35,6 +37,9 @@ void BrowserContentSettingBubbleModelDelegate::ShowContentSettingsPage(
     case CONTENT_SETTINGS_TYPE_MIXEDSCRIPT:
       // We don't (yet?) implement user-settable exceptions for mixed script
       // blocking, so bounce to an explanatory page for now.
+      UMA_HISTOGRAM_ENUMERATION("ContentSettings.MixedScript",
+          TabSpecificContentSettings::MIXEDSCRIPT_CLICKED_LEARN_MORE,
+          TabSpecificContentSettings::MIXEDSCRIPT_CONTENT_NUM_EVENTS);
       chrome::AddSelectedTabWithURL(browser_,
                                     GURL(kInsecureScriptHelpUrl),
                                     ui::PAGE_TRANSITION_LINK);