Add a function triggering extension installed to ExtensionRegistryObserver

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 5463968d73ac7c4bfa1f3389b1db804bd027f7b5..5e5e2af9d8d38c7fa34ee2c1d47b5f0b282df7ad 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1933,6 +1933,9 @@ void ExtensionService::FinishInstallation(const Extension* extension) {
       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