handleChange = function handleChange(hex, e) {
	    _color2.default.isValidHex(hex) && onChange({
	      hex: hex,
	      source: 'hex'
	    }, e);
	  }
Allows user to be alerted to any upgrades that are performed for a given
component type

@param {string} jsClass The class name of the MDL component we wish
to hook into for any upgrades performed.
@param {function(!HTMLElement)} callback The function to call upon an
upgrade. This function should expect 1 parameter - the HTMLElement which
got upgraded.