Wake Lock API implementation (Chromium part)

content/browser/wake_lock/wake_lock_state.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 CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_STATE_H_
+#define CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_STATE_H_
+
+#include <set>
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class RenderFrameHost;
+
+// Encapsulates wake lock state decision logic for WebContents. Clients update
+// this object's state and read resulting lock status via |GetLockState()|.
+class CONTENT_EXPORT WakeLockState final {
+ public:
+  WakeLockState();
+  ~WakeLockState();
+
+  void AddFrame(const RenderFrameHost* frame);
+  void RemoveFrame(const RenderFrameHost* frame);
+  void RemoveAllFrames();
+
+  bool HasFrame() const;
+
+ private:
+  std::set<const RenderFrameHost*> frames_requesting_lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(WakeLockState);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_STATE_H_