Aura overlay scrollbars adjust color for dark backgrounds

ui/native_theme/material_design_constants.h

+// 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 UI_NATIVE_THEME_MATERIAL_DESIGN_CONSTANTS_H_
+#define UI_NATIVE_THEME_MATERIAL_DESIGN_CONSTANTS_H_
+
+#include "ui/gfx/skia_util.h"
+
+namespace ui {
+
+const SkAlpha kMDScrollbarAlphaNormal = 0x4D;
+const SkAlpha kMDScrollbarAlphaHovered = 0x80;
+const SkAlpha kMDScrollbarAlphaPressed = 0x80;
+
+const SkColor kMDScrollbarThumbColor = SkColorSetRGB(0x0, 0x0, 0x0);
+
+const SkColor kMDScrollbarStrokeColor = SkColorSetRGB(0xFF, 0xFF, 0xFF);
+const int kMDScrollbarStrokeWidth = 1;
+
+const int kMDScrollbarThumbWidthNormal = 6;
+const int kMDScrollbarThumbWidthHovered = 10;
+const int kMDScrollbarThumbWidthPressed = 10;
+
+const int kMDScrollbarFadeOutDelayMs = 1000;
+const int kMDScrollbarFadeOutDurationMs = 200;
+
+} // namespace ui
+
+#endif // UI_NATIVE_THEME_MATERIAL_DESIGN_CONSTANTS_H_