[animation-worklet] Implement registerAnimator in worklet scope

third_party/WebKit/Source/modules/compositorworker/Animator.h

Index: third_party/WebKit/Source/modules/compositorworker/Animator.h
diff --git a/third_party/WebKit/Source/modules/compositorworker/Animator.h b/third_party/WebKit/Source/modules/compositorworker/Animator.h
new file mode 100644
index 0000000000000000000000000000000000000000..f5e12890132df232cf96daa917a8a1c61be84094
--- /dev/null
+++ b/third_party/WebKit/Source/modules/compositorworker/Animator.h
@@ -0,0 +1,41 @@
+// 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 Animator_h
+#define Animator_h
+
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "platform/heap/Handle.h"
+#include "v8/include/v8.h"
+
+namespace blink {
+
+class ScriptState;
+class AnimatorDefinition;
+
+class Animator final : public GarbageCollectedFinalized<Animator> {
+ public:
+  static Animator* create(ScriptState*,
+                          AnimatorDefinition*,
+                          v8::Local<v8::Object> instance);
+  ~Animator();
+  DECLARE_TRACE();
+
+  void animate() const;
+
+ private:
+  Animator(ScriptState*, AnimatorDefinition*, v8::Local<v8::Object> instance);
+
+  RefPtr<ScriptState> m_scriptState;
+
+  // This object keeps the definition object, and animator instance alive.
+  // It needs to be destroyed to break a reference cycle between it and the
+  // AnimationWorkletGlobalScope.
+  Member<AnimatorDefinition> m_definition;
+  ScopedPersistent<v8::Object> m_instance;
+};
+
+}  // namespace blink
+
+#endif  // Animator_h