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, returning true if
+  // it succeeds or false otherwise.
+  //
+  // On a false return it may still be possible to start the animation on the
+  // compositor later (e.g. if an incompatible property is removed from the
+  // element), so the caller should try again next main frame.
+  virtual bool StartOnCompositor() = 0;
+
+  DEFINE_INLINE_VIRTUAL_TRACE() {}
+};
+
+}  // namespace blink
+
+#endif  // WorkletAnimationBase_h