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diff --git a/layout/base/nsCSSColorUtils.h b/layout/base/nsCSSColorUtils.h
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+++ b/layout/base/nsCSSColorUtils.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* functions that manipulate colors */
+
+#ifndef __nsCSSColorUtils_h
+#define __nsCSSColorUtils_h
+
+#include "nsColor.h"
+
+// "Sufficient contrast" is determined by
+// "Techniques For Accessibility Evalution And Repair Tools".
+// See http://www.w3.org/TR/AERT#color-contrast
+#define NS_SUFFICIENT_LUMINOSITY_DIFFERENCE 125000
+// NS_SUFFICIENT_LUMINOSITY_DIFFERENCE is the a11y standard for text
+// on a background. Use 20% of that standard since we have a background
+// on top of another background
+#define NS_SUFFICIENT_LUMINOSITY_DIFFERENCE_BG \
+  (NS_SUFFICIENT_LUMINOSITY_DIFFERENCE / 5)
+
+#define NS_LUMINOSITY_DIFFERENCE(a, b)                    \
+  int32_t(mozilla::Abs(NS_GetLuminosity(a | 0xff000000) - \
+                       NS_GetLuminosity(b | 0xff000000)))
+
+// Maximum value that NS_GetLuminosity can return.
+#define NS_MAX_LUMINOSITY 255000
+
+// To determine 3D colors for groove / ridge borders based on the border color
+void NS_GetSpecial3DColors(nscolor aResult[2], nscolor aBorderColor);
+
+// Determins brightness for a specific color
+int NS_GetBrightness(uint8_t aRed, uint8_t aGreen, uint8_t aBlue);
+
+// Get Luminosity of a specific color. That is same as Y of YIQ color space.
+// The range of return value is 0 to NS_MAX_LUMINOSITY.
+int32_t NS_GetLuminosity(nscolor aColor);
+
+// function to convert from RGBA color space to HSVA color space
+void NS_RGB2HSV(nscolor aColor, uint16_t& aHue, uint16_t& aSat,
+                uint16_t& aValue, uint8_t& aAlpha);
+
+// function to convert from HSVA color space to RGBA color space
+void NS_HSV2RGB(nscolor& aColor, uint16_t aHue, uint16_t aSat, uint16_t aValue,
+                uint8_t aAlpha);
+
+#endif