Worker: Enable UseCounter for SharedWorkerGlobalScope

content/common/worker_use_counter.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 CONTENT_COMMON_WORKER_USE_COUNTER_H_
+#define CONTENT_COMMON_WORKER_USE_COUNTER_H_
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+// A mirror of UseCounter on WorkerGlobalScope in Blink-side.
+class CONTENT_EXPORT WorkerUseCounter {
+ public:
+  WorkerUseCounter();
+  explicit WorkerUseCounter(std::vector<char> counter);
+  ~WorkerUseCounter();
+
+  void Count(uint32_t feature);
+  bool IsCounted(uint32_t feature);
+
+  // Returns an internal bit vector that represents a use counter.
+  std::vector<char> Dump();
+
+  size_t GetNumberOfBits() const;
+
+ private:
+  std::vector<char> counter_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_WORKER_USE_COUNTER_H_