Hi Glenn, as Mihir says, you can put it in your customed css. I have aardvark theme in a 3.1 moolde, and this is de css for the fonts:
/* latin-ext */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 200;
src: local('Titillium WebThin'), local('TitilliumWeb-Thin'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr8iECVzy6_x5mCR1UJr_CgI.woff2) format('woff2');
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 200;
src: local('Titillium WebThin'), local('TitilliumWeb-Thin'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wprwWgvz7nq97YPMIWeoEnHDE.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
/* latin-ext */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 300;
src: local('Titillium WebLight'), local('TitilliumWeb-Light'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr9INifKjd1RJ3NxxEi9Cy2w.woff2) format('woff2');
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 300;
src: local('Titillium WebLight'), local('TitilliumWeb-Light'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr4-67659ICLY8bMrYhtePPA.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
/* latin-ext */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 400;
src: local('Titillium Web'), local('TitilliumWeb-Regular'), url(http://fonts.gstatic.com/s/titilliumweb/v4/7XUFZ5tgS-tD6QamInJTcSo_WB_cotcEMUw1LsIE8mM.woff2) format('woff2');
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 400;
src: local('Titillium Web'), local('TitilliumWeb-Regular'), url(http://fonts.gstatic.com/s/titilliumweb/v4/7XUFZ5tgS-tD6QamInJTcZSnX671uNZIV63UdXh3Mg0.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
/* latin-ext */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 600;
src: local('Titillium WebSemiBold'), local('TitilliumWeb-SemiBold'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr_SNRT0fZ5CX-AqRkMYgJJo.woff2) format('woff2');
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 600;
src: local('Titillium WebSemiBold'), local('TitilliumWeb-SemiBold'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr46gJz9aNFrmnwBdd69aqzY.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
/* latin-ext */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 700;
src: local('Titillium WebBold'), local('TitilliumWeb-Bold'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr-y7CP8YvcHYdGV61pt7QTE.woff2) format('woff2');
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 700;
src: local('Titillium WebBold'), local('TitilliumWeb-Bold'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wprxP6Eu1_xfSBSoi9uie1FdE.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
/* latin-ext */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 900;
src: local('Titillium WebBlack'), local('TitilliumWeb-Black'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr4raJW_TPRbuWfMPkVNer-Y.woff2) format('woff2');
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Titillium Web';
font-style: normal;
font-weight: 900;
src: local('Titillium WebBlack'), local('TitilliumWeb-Black'), url(http://fonts.gstatic.com/s/titilliumweb/v4/anMUvcNT0H1YN4FII8wpr6C95lFCEhr9IpXC9cjRuaU.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
I hope you find it useful.
Regards.