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

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

Index: third_party/polymer/components/iron-selector/.bower.json
diff --git a/third_party/polymer/components/iron-selector/.bower.json b/third_party/polymer/components/iron-selector/.bower.json
index ced62c48a852a1582bef8cf633669a62ac8d65c1..8365f669355c0de5b54548f24e945cb8af54115d 100644
--- a/third_party/polymer/components/iron-selector/.bower.json
+++ b/third_party/polymer/components/iron-selector/.bower.json
@@ -1,10 +1,15 @@
 {
   "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"
   ],
@@ -30,11 +35,11 @@
     "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",