Initial implementation of WorkletAnimation

third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.idl

Index: third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.idl
diff --git a/third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.idl b/third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.idl
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index 0000000000000000000000000000000000000000..3ebac23ae63d01e470b84a082068d04fa5f24221
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+++ b/third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.idl
@@ -0,0 +1,20 @@
+// Copyright 2017 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.
+
+// TODO(smcgruer): Spec link.

[majidvp, 2017/08/31 14:15:27]

I think this is the right link: 
https://wicg.github.io/animation-worklet/#worklet-animation-desc

[smcgruer, 2017/08/31 19:59:57]

Done.

+
+enum AnimationPlayState { "idle", "pending", "running" };
+
+[
+    Constructor(DOMString animatorName,
+                sequence<KeyframeEffectReadOnly> effects,
+                sequence<(DocumentTimeline or ScrollTimeline)> timelines,

[majidvp, 2017/08/31 14:24:05]

FYI, the latest changes in spec has moved away from having
multiple timelines passed in constructor but given the flux
in this area and potential for change I am fine with not
changing this initial implementation yet and wait for
spec to land on final solution here.

[smcgruer, 2017/08/31 19:59:57]

Acknowledged.

+                SerializedScriptValue options),
+    RaisesException=Constructor,
+    RuntimeEnabled=CompositorWorker
+] interface WorkletAnimation {
+  readonly attribute AnimationPlayState playState;
+  void play();
+  void cancel();
+};