compositor-worker: plumb element id and mutable properties

third_party/WebKit/Source/core/dom/CompositorProxiedPropertySet.h

+// Copyright 2015 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 CompositorProxiedPropertySet_h
+#define CompositorProxiedPropertySet_h
+
+#include "platform/heap/Handle.h"
+#include "public/platform/WebCompositorMutableProperties.h"
+
+namespace blink {
+
+// Keeps track of the number of proxies bound to each property.
+class CompositorProxiedPropertySet final : public NoBaseWillBeGarbageCollectedFinalized<CompositorProxiedPropertySet> {
+    WTF_MAKE_NONCOPYABLE(CompositorProxiedPropertySet);
+    USING_FAST_MALLOC_WILL_BE_REMOVED(CompositorProxiedPropertySet);
+public:
+    static PassOwnPtrWillBeRawPtr<CompositorProxiedPropertySet> create();
+    virtual ~CompositorProxiedPropertySet();
+
+    DEFINE_INLINE_TRACE() { }
+
+    bool isEmpty() const;
+    void increment(uint32_t mutableProperties);
+    void decrement(uint32_t mutableProperties);
+    uint32_t proxiedProperties() const;
+
+private:
+    CompositorProxiedPropertySet();
+
+    unsigned short m_counts[kNumWebCompositorMutableProperties];
+};
+
+} // namespace blink
+
+#endif // CompositorProxiedPropertySet_h