Implement Permissions.query() and static PermissionStatus.

Source/modules/permissions/PermissionQueryCallback.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 PermissionQueryCallback_h
+#define PermissionQueryCallback_h
+
+#include "platform/heap/Handle.h"
+#include "public/platform/WebCallbacks.h"
+#include "public/platform/modules/permissions/WebPermissionStatus.h"
+#include "public/platform/modules/permissions/WebPermissionType.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class ScriptPromiseResolver;
+
+// PermissionQueryCallback is an implementation of WebPermissionQueryCallbacks
+// that will resolve the underlying promise depending on the result passed to
+// the callback. It takes a WebPermissionType in its constructor and will pass
+// it to the PermissionStatus.
+class PermissionQueryCallback final
+    : public WebCallbacks<WebPermissionStatus, void> {
+public:
+    explicit PermissionQueryCallback(PassRefPtr<ScriptPromiseResolver>, WebPermissionType);
+    virtual ~PermissionQueryCallback();
+
+    void onSuccess(WebPermissionStatus*) override;
+    void onError() override;
+
+private:
+    RefPtr<ScriptPromiseResolver> m_resolver;
+    WebPermissionType m_permissionType;
+
+    WTF_MAKE_NONCOPYABLE(PermissionQueryCallback);
+};
+
+} // namespace blink
+
+#endif // PermissionQueryCallback_h