[themes] color by name

src/vs/base/common/color.ts

@@ -420,4 +420,12 @@ export class Color {
 		factor = factor * (lum1 - lum2) / lum1;
 		return of.darken(factor);
 	}
-}
+
+	public static readonly white = new Color(new RGBA(255, 255, 255, 255));
+	public static readonly black = new Color(new RGBA(0, 0, 0, 255));
+	public static readonly red = new Color(new RGBA(255, 0, 0, 255));
+	public static readonly blue = new Color(new RGBA(0, 0, 255, 255));
+	public static readonly green = new Color(new RGBA(0, 255, 0, 255));
+	public static readonly cyan = new Color(new RGBA(0, 255, 255, 255));
+	public static readonly lightgrey = new Color(new RGBA(211, 211, 211, 255));
+}
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