First version of PerformanceObserver

Source/core/timing/PerformanceObserverInit.idl

Index: Source/core/timing/PerformanceObserverInit.idl
diff --git a/Source/core/timing/PerformanceObserverInit.idl b/Source/core/timing/PerformanceObserverInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..314fa67902bfec28c3af3dd5f0d77081448d6f0a
--- /dev/null
+++ b/Source/core/timing/PerformanceObserverInit.idl
@@ -0,0 +1,10 @@
+// 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://w3c.github.io/performance-timeline/#the-performance-observer-interface
+[
+    RuntimeEnabled=PerformanceObserverSupport,  // Experimental flag

[adamk, 2015/07/24 21:26:30]

This 'Experimental flag' comment and the others like it in this patch should be
dropped; they'll become stale as soon as the flag changes state.

[MikeB, 2015/07/24 23:07:15]

Done.

+] dictionary PerformanceObserverInit {
+    required sequence<DOMString> entryType;

[adamk, 2015/07/24 21:26:30]

The spec says "typeFilter" here; should this say "typeFilter" too?

[MikeB, 2015/07/24 23:07:15]

Done.

+};