Stub implementation of Permissions API module.

Source/modules/permissions/PermissionStatus.h

Index: Source/modules/permissions/PermissionStatus.h
diff --git a/Source/modules/permissions/PermissionStatus.h b/Source/modules/permissions/PermissionStatus.h
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+++ b/Source/modules/permissions/PermissionStatus.h
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+// Copyright 2014 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 PermissionStatus_h
+#define PermissionStatus_h
+
+#include "core/dom/ContextLifecycleObserver.h"
+#include "core/events/EventTarget.h"
+#include "platform/heap/Handle.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class ExecutionContext;
+
+class PermissionStatus final
+    : public RefCountedGarbageCollectedWillBeGarbageCollectedFinalized<PermissionStatus>
+    , public EventTargetWithInlineData
+    , public ContextLifecycleObserver {
+    DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<PermissionStatus>);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PermissionStatus);
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PermissionStatus* create(ExecutionContext*);
+    ~PermissionStatus() override;
+
+    // EventTarget implementation.
+    const AtomicString& interfaceName() const override;
+    ExecutionContext* executionContext() const override;
+
+    void trace(Visitor*) override;
+
+    String status() const;
+
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
+
+private:
+    explicit PermissionStatus(ExecutionContext*);
+};
+
+} // namespace blink
+
+#endif // PermissionStatus_h