Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/log_private/log_private_api_chromeos.cc

Index: chrome/browser/extensions/api/log_private/log_private_api_chromeos.cc
diff --git a/chrome/browser/extensions/api/log_private/log_private_api_chromeos.cc b/chrome/browser/extensions/api/log_private/log_private_api_chromeos.cc
index ffe1dc08f641111d18324db55dbf5f02d6288338..13dc7fffc3116cf71ef1d7fcd10588349f81b39a 100644
--- a/chrome/browser/extensions/api/log_private/log_private_api_chromeos.cc
+++ b/chrome/browser/extensions/api/log_private/log_private_api_chromeos.cc
@@ -249,8 +249,9 @@ void LogPrivateAPI::AddEntriesOnUI(scoped_ptr<base::ListValue> value) {
     // Create the event's arguments value.
     scoped_ptr<base::ListValue> event_args(new base::ListValue());
     event_args->Append(value->DeepCopy());
-    scoped_ptr<Event> event(
-        new Event(events::kOnCapturedEvents, event_args.Pass()));
+    scoped_ptr<Event> event(new Event(::extensions::events::UNKNOWN,
+                                      ::events::kOnCapturedEvents,
+                                      event_args.Pass()));
     EventRouter::Get(browser_context_)
         ->DispatchEventToExtension(*ix, event.Pass());
   }