Wake Lock API implementation (Blink part)

Source/modules/wake_lock/WakeLock.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 WakeLock_h
+#define WakeLock_h
+
+#include "core/dom/DocumentLifecycleObserver.h"
+#include "core/dom/DocumentSupplementable.h"
+#include "core/page/PageVisibilityState.h"
+#include "modules/wake_lock/WakeLockController.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Document;
+
+class WakeLock final
+    : public NoBaseWillBeGarbageCollectedFinalized<WakeLock>
+    , public DocumentSupplement
+    , public DocumentLifecycleObserver {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WakeLock);

[mlamouri (slow - plz ping), 2015/05/05 13:45:44]

WTF_MAKE_NONCOPYABLE?

+public:
+    static const char* supplementName();
+    static WakeLock& from(Document&);
+
+    static bool keepScreenAwake(Document&);
+    static void setKeepScreenAwake(Document&, bool);
+
+    // DocumentLifecycleObserver implementation
+    virtual void documentWasDetached() override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    class WakeLockDocumentVisibilityObserver;
+
+    explicit WakeLock(Document&);
+
+    void didChangeVisibilityState(PageVisibilityState);
+    void setKeepScreenAwake(bool);
+    void notifyController() const;
+
+    RawPtrWillBeMember<WakeLockController> m_controller;
+
+    // We need visibility observer as a member rather than as a base becasue
+    // when Oilpan is disabled, we need to be able to delete it before
+    // Document's destructor runs, as it asserts empty visibility observer list.
+    // This instance is owned by Document's base DocumentSupplementable, so
+    // it will be destroyed only after Document's destructor has finished.
+    OwnPtrWillBeMember<WakeLockDocumentVisibilityObserver> m_observer;
+
+    PageVisibilityState m_pageVisibilityState;
+    bool m_keepScreenAwake;
+};
+
+} // namespace blink
+
+#endif // WakeLock_h