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

chrome/browser/performance_monitor/performance_monitor.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/performance_monitor/performance_monitor.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 474 matching lines @@
 
   if (initialized_ && !request.url().SchemeIsFile())
     performance_data_for_io_thread_.network_bytes_read += bytes_read;
 }
 
 void PerformanceMonitor::Observe(int type,
                                  const content::NotificationSource& source,
                                  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: {
       AddExtensionEvent(EVENT_EXTENSION_ENABLE,
                         content::Details<Extension>(details).ptr());
       break;
     }
     case chrome::NOTIFICATION_EXTENSION_UNLOADED: {
       const extensions::UnloadedExtensionInfo* info =
           content::Details<extensions::UnloadedExtensionInfo>(details).ptr();
@@ skipping 135 matching lines @@
     if (!url_list.empty())
       url_list += ", ";
 
     url_list += url;
   }
 
   AddEvent(util::CreateRendererFailureEvent(base::Time::Now(), type, url_list));
 }
 
 }  // namespace performance_monitor