Set up the infrastructure for Extension event metrics.

extensions/browser/event_listener_map_unittest.cc

Index: extensions/browser/event_listener_map_unittest.cc
diff --git a/extensions/browser/event_listener_map_unittest.cc b/extensions/browser/event_listener_map_unittest.cc
index 9769d08ecd9a33d257960be6586263e45964ed17..6fae050de0f423694b4528fcf946aa3448d9c496 100644
--- a/extensions/browser/event_listener_map_unittest.cc
+++ b/extensions/browser/event_listener_map_unittest.cc
@@ -65,9 +65,9 @@ class EventListenerMapTest : public testing::Test {
                                 const GURL& url) {
     EventFilteringInfo info;
     info.SetURL(url);
-    scoped_ptr<Event> result(new Event(event_name,
-        make_scoped_ptr(new ListValue()), NULL, GURL(),
-        EventRouter::USER_GESTURE_UNKNOWN, info));
+    scoped_ptr<Event> result(
+        new Event(events::UNKNOWN, event_name, make_scoped_ptr(new ListValue()),
+                  NULL, GURL(), EventRouter::USER_GESTURE_UNKNOWN, info));
     return result.Pass();
   }