Log mixed script shield events.

chrome/browser/content_settings/tab_specific_content_settings.h

Index: chrome/browser/content_settings/tab_specific_content_settings.h
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.h b/chrome/browser/content_settings/tab_specific_content_settings.h
index 1948126ae763fc5ec33bf00db880477894180863..8f96b827032764ec104f293ca6df223b80c1a428 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.h
+++ b/chrome/browser/content_settings/tab_specific_content_settings.h
@@ -55,6 +55,15 @@ class TabSpecificContentSettings
   static const MicrophoneCameraState CAMERA_ACCESSED = 1 << 2;
   static const MicrophoneCameraState CAMERA_BLOCKED = 1 << 3;
 
+  // UMA statistics for the mixed content shield
+  enum {
+    MIXEDSCRIPT_DISPLAYED_SHIELD = 0,
+    MIXEDSCRIPT_DISPLAYED_BUBBLE,
+    MIXEDSCRIPT_CLICKED_ALLOW,
+    MIXEDSCRIPT_CLICKED_LEARN_MORE,
+    MIXEDSCRIPT_CONTENT_NUM_EVENTS
+  };
+
   // Classes that want to be notified about site data events must implement
   // this abstract class and add themselves as observer to the
   // |TabSpecificContentSettings|.