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

[alancutter (OOO until 2018), 2017/06/26 11:57:01]

No need for this base class, let's not have it.

[smcgruer, 2017/06/26 21:14:08]

I believe it is required; core/ can't depend on modules/, can it?

We could of course move the code added from modules/compositorworker/ to
core/animation/. I wasn't clear on where new worklets are meant to live;
PaintWorklet was implemented in modules/

[alancutter (OOO until 2018), 2017/06/27 00:15:52]

Oops, I missed the part where it lives in modules.

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