Add paper-dropdown and paper-dropdown-menu and run reproduce.sh

third_party/polymer/bower.json

 {
   "name": "chromium",
   "private": true,
   "dependencies": {
     "polymer": "Polymer/polymer#0.5.2",
 
     "core-a11y-keys": "Polymer/core-a11y-keys#0.5.2",
     "core-ajax": "Polymer/core-ajax#0.5.2",
     "core-animated-pages": "Polymer/core-animated-pages#0.5.2",
     "core-animation": "Polymer/core-animation#0.5.4",
@@ skipping 33 matching lines @@
     "core-signals": "Polymer/core-signals#0.5.2",
     "core-splitter": "Polymer/core-splitter#0.5.2",
     "core-style": "Polymer/core-style#0.5.2",
     "core-toolbar": "Polymer/core-toolbar#0.5.2",
     "core-tooltip": "Polymer/core-tooltip#0.5.2",
     "core-transition": "Polymer/core-transition#0.5.2",
 
     "paper-button": "Polymer/paper-button#0.5.2",
     "paper-checkbox": "Polymer/paper-checkbox#0.5.4",
     "paper-dialog": "Polymer/paper-dialog#0.5.2",
+    "paper-dropdown": "Polymer/paper-dropdown#0.5.2",
+    "paper-dropdown-menu": "Polymer/paper-dropdown-menu#0.5.2",
     "paper-fab": "Polymer/paper-fab#0.5.2",
     "paper-icon-button": "Polymer/paper-icon-button#0.5.2",
     "paper-input": "Polymer/paper-input#0.5.2",
     "paper-item": "Polymer/paper-item#0.5.2",
     "paper-progress": "Polymer/paper-progress#0.5.2",
     "paper-radio-button": "Polymer/paper-radio-button#0.5.4",
     "paper-radio-group": "Polymer/paper-radio-group#0.5.2",
     "paper-ripple": "Polymer/paper-ripple#0.5.2",
     "paper-shadow": "Polymer/paper-shadow#0.5.2",
     "paper-slider": "Polymer/paper-slider#0.5.2",
     "paper-spinner": "Polymer/paper-spinner#0.5.2",
     "paper-tabs": "Polymer/paper-tabs#0.5.2",
     "paper-toast": "Polymer/paper-toast#0.5.2",
     "paper-toggle-button": "Polymer/paper-toggle-button#0.5.4",
 
     "web-animations-js": "web-animations/web-animations-js#1.0.5"
   }
 }