add-filter-to-media-grid.js

 /**
  * A filter dropdown for month/dates.
  */
  wp.media.view.CategoryFilter = wp.media.view.AttachmentFilters.extend({
     id: 'media-attachment-date-filters',
     createFilters: function() {
         var filters = {};
         var categories = ['one', 'two', 'three'];
         _.each( categories || {}, function( value, index ) {
             filters[ index ] = {
                 text: value,
                 props: {
                     category: value,
                 }
             };
         });
         filters.all = {
             text:  'All categories',
             props: {
                 category: false
             },
             priority: 10
         };
         this.filters = filters;
     }
     });
wp.media.frame.content.get().toolbar.set( 'categoryFilter', new wp.media.view.CategoryFilter({
	controller: wp.media.frame,
	model:      new Backbone.Model(),
	priority: -75
}).render() );