[pinpoint] Add iron-form and paper-checkbox to polymer components.

third_party/polymer/components/iron-selector/.bower.json

 {
   "name": "iron-selector",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "description": "Manages a set of elements that can be selected",
   "private": true,
   "license": "http://polymer.github.io/LICENSE.txt",
-  "main": "iron-selector.html",
+  "main": [
+    "iron-selector.html",
+    "iron-multi-selectable.html",
+    "iron-selectable.html",
+    "iron-selection.html"
+  ],
   "authors": [
     "The Polymer Authors"
   ],
   "keywords": [
     "web-components",
     "polymer",
     "selector"
   ],
   "repository": {
     "type": "git",
     "url": "git://github.com/PolymerElements/iron-selector.git"
   },
   "homepage": "https://github.com/PolymerElements/iron-selector",
   "ignore": [],
   "dependencies": {
     "polymer": "Polymer/polymer#^1.2.0"
   },
   "devDependencies": {
     "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",
     "iron-test-helpers": "polymerelements/iron-test-helpers#^1.0.0",
     "paper-styles": "PolymerElements/paper-styles#^1.0.4",
     "test-fixture": "PolymerElements/test-fixture#^1.0.0",
     "web-component-tester": "^4.0.0",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
-  "_release": "1.5.2",
+  "_release": "1.5.3",
   "_resolution": {
     "type": "version",
-    "tag": "v1.5.2",
-    "commit": "18e8e12dcd9a4560de480562f65935feed334b86"
+    "tag": "v1.5.3",
+    "commit": "6486761a670829e2c34625abed0b773b6d9230d6"
   },
   "_source": "https://github.com/polymerelements/iron-selector.git",
   "_target": "^1.0.0",
   "_originalSource": "polymerelements/iron-selector"
 }