Made it possible to tell whether an extension is being installed or updated.

chrome/browser/performance_monitor/performance_monitor.cc

Index: chrome/browser/performance_monitor/performance_monitor.cc
diff --git a/chrome/browser/performance_monitor/performance_monitor.cc b/chrome/browser/performance_monitor/performance_monitor.cc
index 2c56894a877945b9429659487ea36a126a36a4d0..5f805653d5e5520cb90cc5922890388deb5b20f1 100644
--- a/chrome/browser/performance_monitor/performance_monitor.cc
+++ b/chrome/browser/performance_monitor/performance_monitor.cc
@@ -492,8 +492,10 @@ void PerformanceMonitor::Observe(int type,
                                  const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_EXTENSION_INSTALLED: {
-      AddExtensionEvent(EVENT_EXTENSION_INSTALL,
-                        content::Details<Extension>(details).ptr());
+      AddExtensionEvent(
+          EVENT_EXTENSION_INSTALL,
+          content::Details<const extensions::InstalledExtensionInfo>(details)->
+              extension);
       break;
     }
     case chrome::NOTIFICATION_EXTENSION_ENABLED: {