Updated to Chrome 45 (2454) moved from SVN to git.

core/timing/WindowPerformance.idl

Index: core/timing/WindowPerformance.idl
diff --git a/core/timing/WindowPerformance.idl b/core/timing/WindowPerformance.idl
new file mode 100644
index 0000000000000000000000000000000000000000..9418d5d4b898509f5b7d85ed0ca3da59767cde64
--- /dev/null
+++ b/core/timing/WindowPerformance.idl
@@ -0,0 +1,14 @@
+// Copyright 2015 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.
+
+// http://www.w3.org/TR/navigation-timing/#sec-window.performance-attribute
+
+// TODO(philipj): Window.performance should be in High Resolution Time:
+// https://github.com/w3c/hr-time/issues/9
+
+[
+    ImplementedAs=DOMWindowPerformance,
+] partial interface Window {
+    [Replaceable] readonly attribute Performance performance;
+};