Support mask images for filter-based -webkit-box-reflect.

third_party/WebKit/Source/core/paint/BoxReflectionUtils.h

Index: third_party/WebKit/Source/core/paint/BoxReflectionUtils.h
diff --git a/third_party/WebKit/Source/core/paint/BoxReflectionUtils.h b/third_party/WebKit/Source/core/paint/BoxReflectionUtils.h
new file mode 100644
index 0000000000000000000000000000000000000000..40ad50bcc3c4381a842dfc1e8afd608babf099fa
--- /dev/null
+++ b/third_party/WebKit/Source/core/paint/BoxReflectionUtils.h
@@ -0,0 +1,20 @@
+// Copyright 2016 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 BoxReflectionUtils_h
+#define BoxReflectionUtils_h
+
+namespace blink {
+
+class BoxReflection;
+class ComputedStyle;
+class PaintLayer;
+
+// Utilities for manipulating box reflections in terms of core concepts, like
+// PaintLayer.
+BoxReflection boxReflectionForPaintLayer(const PaintLayer&, const ComputedStyle&);
+
+} // namespace blink
+
+#endif // BoxReflectionUtils_h