Wake Lock API implementation (Blink part)

Source/modules/wake_lock/ScreenWakeLock.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 ScreenWakeLock_h
+#define ScreenWakeLock_h
+
+#include "core/frame/LocalFrameLifecycleObserver.h"
+#include "core/page/PageLifecycleObserver.h"
+#include "modules/ModulesExport.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class LocalFrame;
+class Screen;
+class WebWakeLockClient;
+
+class MODULES_EXPORT ScreenWakeLock final : public NoBaseWillBeGarbageCollected<ScreenWakeLock>, public WillBeHeapSupplement<LocalFrame>, public PageLifecycleObserver, public LocalFrameLifecycleObserver {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ScreenWakeLock);
+    WTF_MAKE_NONCOPYABLE(ScreenWakeLock);
+public:
+    static bool keepAwake(Screen&);
+    static void setKeepAwake(Screen&, bool);
+
+    bool keepAwake() const { return m_keepAwake; }
+    void setKeepAwake(bool);
+
+    static const char* supplementName();
+    static ScreenWakeLock* from(LocalFrame*);
+    static void provideTo(LocalFrame&, WebWakeLockClient*);
+
+    // Inherited from PageLifecycleObserver.
+    void pageVisibilityChanged() override;
+    void didCommitLoad(LocalFrame*) override;
+
+    // Inherited from LocalFrameLifecycleObserver.
+    void willDetachFrameHost() override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    ScreenWakeLock(LocalFrame&, WebWakeLockClient*);
+
+    static ScreenWakeLock* fromScreen(Screen&);
+    void notifyClient();
+
+    WebWakeLockClient* m_client;
+    bool m_keepAwake;
+};
+
+} // namespace blink
+
+#endif // ScreenWakeLock_h