Initial implementation of WorkletAnimation

third_party/WebKit/Source/core/animation/WorkletAnimationController.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 WorkletAnimationController_h
+#define WorkletAnimationController_h
+
+#include "core/CoreExport.h"
+#include "platform/heap/GarbageCollected.h"
+#include "platform/heap/HeapAllocator.h"
+#include "platform/heap/Visitor.h"
+
+namespace blink {
+
+class WorkletAnimationBase;
+
+// Handles AnimationWorklet animations on the main-thread.
+//
+// The WorkletAnimationController is responsible for owning WorkletAnimation
+// instances are long as they are relevant to the animation system. It is also
+// responsible for starting valid WorkletAnimations on the compositor side and
+// updating WorkletAnimations with updated results from their underpinning
+// AnimationWorklet animator instance.
+//
+// For more details on AnimationWorklet, see the spec:
+// https://wicg.github.io/animation-worklet
+class CORE_EXPORT WorkletAnimationController
+    : public GarbageCollectedFinalized<WorkletAnimationController> {
+ public:
+  WorkletAnimationController();
+  virtual ~WorkletAnimationController();
+
+  void AttachAnimation(WorkletAnimationBase&);
+  void DetachAnimation(WorkletAnimationBase&);
+
+  void Update();
+
+  DECLARE_TRACE();
+
+ private:
+  HeapHashSet<Member<WorkletAnimationBase>> pending_animations_;
+  HeapHashSet<Member<WorkletAnimationBase>> compositor_animations_;
+};
+
+}  // namespace blink
+
+#endif  // WorkletAnimationController_h