class MetaThemeColor extends React.Component {
    render() {
        const {color} = this.props;

        if (window && window.document) {
            const metaThemeColor = window.document.createElement('meta');

            const nameAttribute = window.document.createAttribute('name');
            nameAttribute.value = 'theme-color';
            const contentAttribute = window.document.createAttribute('content');
            contentAttribute.value = color;

            metaThemeColor.setAttributeNode(nameAttribute);
            metaThemeColor.setAttributeNode(contentAttribute);

            window.document.getElementsByTagName('head')[0].appendChild(metaThemeColor);
        }

        return null;
    }
}

//в render()-методе App:
render() {
        const {localeStore} = this.props;
        const pickersLocale = muiPickersLocaleMap[localeStore.currentLocale] || enLocale;

        return <div style={{
            flexGrow: 1
        }}>
            <MuiThemeProvider theme={theme}>
                <MuiPickersUtilsProvider utils={DateFnsUtils} locale={pickersLocale}>
                    <MetaThemeColor color={theme.palette.primary.main}/>
                    <MobxRouter/>
                </MuiPickersUtilsProvider>
            </MuiThemeProvider>
        </div>
    }