src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/SetColorThemeAction/update
class SetColorThemeAction:	update(): void {
		this.workbenchThemeService.getColorThemes().then(colorThemes => {
			this.enabled = this.computeEnablement(colorThemes);
			this.class = this.enabled ? SetColorThemeAction.EnabledClass : SetColorThemeAction.DisabledClass;
		});
	}