Initial implementation of WorkletAnimation

third_party/WebKit/Source/core/animation/WorkletAnimationBase.h

+// 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.
+
+#ifndef WorkletAnimationBase_h
+#define WorkletAnimationBase_h
+
+#include "core/CoreExport.h"
+#include "platform/heap/GarbageCollected.h"
+
+namespace blink {
+
+class CORE_EXPORT WorkletAnimationBase
+    : public GarbageCollectedFinalized<WorkletAnimationBase> {
+ public:
+  virtual ~WorkletAnimationBase() {}
+
+  // Attempts to start the animation on the compositor side. Once this has
+  // returned true, it should not be called again.

[flackr, 2017/09/07 15:59:13]

It's a bit of a strange interface, it might be worth explaining why it would
return false and that you should keep calling it (every main frame?) until it
returns true?

[smcgruer, 2017/09/11 18:18:59]

Changed the comment to better reflect reality.

+  virtual bool StartOnCompositor() = 0;
+
+  DEFINE_INLINE_VIRTUAL_TRACE() {}
+};
+
+}  // namespace blink
+
+#endif  // WorkletAnimationBase_h