src/vs/workbench/services/themes/common/colorThemeData.ts/ColorThemeData/setCustomColors
class ColorThemeData:	public setCustomColors(colors: IColorCustomizations) {
		this.customColorMap = {};
		this.overwriteCustomColors(colors);

		const themeSpecificColors = this.getThemeSpecificColors(colors) as IColorCustomizations;
		if (types.isObject(themeSpecificColors)) {
			this.overwriteCustomColors(themeSpecificColors);
		}

		this.tokenColorIndex = undefined;
		this.textMateThemingRules = undefined;
		this.customTokenScopeMatchers = undefined;
	}