compositor-worker: plumb element id and mutable properties

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

Index: third_party/WebKit/Source/core/dom/ProxiedPropertyCounts.h
diff --git a/third_party/WebKit/Source/core/dom/ProxiedPropertyCounts.h b/third_party/WebKit/Source/core/dom/ProxiedPropertyCounts.h
new file mode 100644
index 0000000000000000000000000000000000000000..76dbf9d64cb858f060f15821fc9f8c398f3ae783
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/ProxiedPropertyCounts.h
@@ -0,0 +1,36 @@
+// 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 ProxiedPropertyCounts_h
+#define ProxiedPropertyCounts_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 ProxiedPropertyCounts final : public NoBaseWillBeGarbageCollectedFinalized<ProxiedPropertyCounts> {
+    WTF_MAKE_NONCOPYABLE(ProxiedPropertyCounts);
+    USING_FAST_MALLOC_WILL_BE_REMOVED(ProxiedPropertyCounts);
+public:
+    static PassOwnPtrWillBeRawPtr<ProxiedPropertyCounts> create();
+    virtual ~ProxiedPropertyCounts();
+
+    DEFINE_INLINE_TRACE() { }
+
+    bool empty() const;
+    void increment(uint32_t mutableProperties);
+    void decrement(uint32_t mutableProperties);
+    uint32_t proxiedProperties() const;
+
+private:
+    ProxiedPropertyCounts();
+
+    unsigned short m_counts[kNumWebCompositorMutableProperties];
+};
+
+} // namespace blink
+
+#endif // ProxiedPropertyCounts_h