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diff --git a/gfx/thebes/DisplayConfigWindows.h b/gfx/thebes/DisplayConfigWindows.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_gfx_thebes_DisplayConfigWindows_h
+#define mozilla_gfx_thebes_DisplayConfigWindows_h
+
+#include <utility> // for std::pair
+#include "mozilla/gfx/Point.h" // for IntSize
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace gfx {
+
+extern bool HasScaledResolution();
+
+typedef nsTArray<std::pair<IntSize, IntSize>> ScaledResolutionSet;
+void GetScaledResolutions(ScaledResolutionSet& aRv);
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif // mozilla_gfx_thebes_DisplayConfigWindows_h