[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/webcomponentsjs/bower.json

Index: polymer_1.2.3/bower_components/webcomponentsjs/bower.json
diff --git a/polymer_1.0.4/bower_components/webcomponentsjs/bower.json b/polymer_1.2.3/bower_components/webcomponentsjs/bower.json
similarity index 75%
copy from polymer_1.0.4/bower_components/webcomponentsjs/bower.json
copy to polymer_1.2.3/bower_components/webcomponentsjs/bower.json
index aede49c50bea6c56da7cef2fe4a1567ef728af99..8bcb0c1c9c7f43e9c99f1aae36bfddbc0e5b1c25 100644
--- a/polymer_1.0.4/bower_components/webcomponentsjs/bower.json
+++ b/polymer_1.2.3/bower_components/webcomponentsjs/bower.json
@@ -1,7 +1,7 @@
 {
   "name": "webcomponentsjs",
   "main": "webcomponents.js",
-  "version": "0.7.5",
+  "version": "0.7.20",
   "homepage": "http://webcomponents.org",
   "authors": [
     "The Polymer Authors"
@@ -14,5 +14,8 @@
     "webcomponents"
   ],
   "license": "BSD",
-  "ignore": []
+  "ignore": [],
+  "devDependencies": {
+    "web-component-tester": "^4.0.1"
+  }
 }