Rolling forward https://codereview.chromium.org/1155683008/ which was

third_party/polymer/v1_0/components/paper-toast/bower.json

 {
   "name": "paper-toast",
   "version": "1.0.0",
   "description": "A material design notification toast",
   "private": true,
   "license": "http://polymer.github.io/LICENSE.txt",
   "authors": [
     "The Polymer Authors"
   ],
   "keywords": [
     "web-components",
     "polymer",
     "toast",
     "notification"
   ],
   "main": "paper-toast.html",
   "dependencies": {
     "paper-styles": "PolymerElements/paper-styles#^1.0.0",
     "polymer": "Polymer/polymer#^1.0.0",
     "iron-a11y-announcer": "polymerelements/iron-a11y-announcer#^1.0.0"
   },
   "devDependencies": {
     "iron-component-page": "polymerelements/iron-component-page#^1.0.0",
     "paper-button": "polymerelements/paper-button#^1.0.0",
     "web-component-tester": "*",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   }
 }