Web Animations: Add AnimationEffectTimingProperties IDL dictionary

third_party/WebKit/Source/core/animation/AnimationEffectTimingProperties.idl

+// Copyright 2016 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.
+
+// https://w3c.github.io/web-animations/#the-animationeffecttimingproperties-dictionary
+
+enum FillMode { "none", "forwards", "backwards", "both", "auto" };
+enum PlaybackDirection { "normal", "reverse", "alternate", "alternate-reverse" };
+
+dictionary AnimationEffectTimingProperties {
+    double                             delay = 0;
+    double                             endDelay = 0;
+    FillMode                           fill = "auto";
+    double                             iterationStart = 0.0;
+    unrestricted double                iterations = 1.0;
+    (unrestricted double or DOMString) duration = "auto";
+    // TODO(alancutter): Remove playbackRate.
+    double                             playbackRate = 1.0;
+    PlaybackDirection                  direction = "normal";
+    DOMString                          easing = "linear";
+};