First version of PerformanceObserver

Source/core/timing/PerformanceObserverEntryList.idl

Index: Source/core/timing/PerformanceObserverEntryList.idl
diff --git a/Source/core/timing/PerformanceObserverEntryList.idl b/Source/core/timing/PerformanceObserverEntryList.idl
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index 0000000000000000000000000000000000000000..0d34346c27f82dc97087fd5bec2d8a8b5d87fd16
--- /dev/null
+++ b/Source/core/timing/PerformanceObserverEntryList.idl
@@ -0,0 +1,16 @@
+// 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=PerformanceObserver,
+    Exposed=(Window,Worker),
+    GarbageCollected,
+] interface PerformanceObserverEntryList {
+    // TODO(philipj): getEntries() should take an optional FilterOptions argument.
+    sequence<PerformanceEntry> getEntries();
+    sequence<PerformanceEntry> getEntriesByType(DOMString entryType);
+    sequence<PerformanceEntry> getEntriesByName(DOMString name, optional DOMString entryType = null);
+};