Add a function triggering extension installed to ExtensionRegistryObserver

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 2013 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/extensions/extension_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 
@@ skipping 1915 matching lines @@
   if (existing_extension) {
     is_update = true;
     old_name = existing_extension->name();
   }
   extensions::InstalledExtensionInfo details(extension, is_update, old_name);
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_INSTALLED,
       content::Source<Profile>(profile_),
       content::Details<const extensions::InstalledExtensionInfo>(&details));
 
+  ExtensionRegistry::Get(profile_)
+      ->TriggerOnWillBeInstalled(extension, is_update, old_name);
+
   bool unacknowledged_external = IsUnacknowledgedExternalExtension(extension);
 
   // Unpacked extensions default to allowing file access, but if that has been
   // overridden, don't reset the value.
   if (Manifest::ShouldAlwaysAllowFileAccess(extension->location()) &&
       !extension_prefs_->HasAllowFileAccessSetting(extension->id())) {
     extension_prefs_->SetAllowFileAccess(extension->id(), true);
   }
 
   AddExtension(extension);
@@ skipping 491 matching lines @@
 }
 
 void ExtensionService::OnProfileDestructionStarted() {
   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
        it != ids_to_unload.end();
        ++it) {
     UnloadExtension(*it, UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN);
   }
 }