Fix cups manufacturer and model dropdowns.

chrome/browser/resources/settings/printing_page/cups_add_printer_dialog_util.html

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-dropdown/iron-dropdown.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-input/iron-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input-container.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="/printing_page/cups_printers_browser_proxy.html">
@@ skipping 40 matching lines @@
         };
       }
 
       iron-dropdown .dropdown-content paper-item {
         min-height: 40px;
       }
     </style>
     <paper-input-container no-label-float>
       <input is="iron-input" type="search" on-tap="onTap_"
           on-search="onInputValueChanged_" on-change="onChange_" incremental>
-      <paper-icon-button suffix id="searchIcon" icon="cr:search" hidden>
+      <paper-icon-button suffix id="searchIcon" icon="cr:search" on-tap="onTap_"
+                         hidden>
       </paper-icon-button>
-      <paper-icon-button suffix id="dropdownIcon" icon="cr:arrow-drop-down">
+      <paper-icon-button suffix id="dropdownIcon" icon="cr:arrow-drop-down"
+                         on-tap="onTap_">

[dpapad, 2017/01/27 22:24:25]

Instead of adding the onTap_ listener three times, could you add it in the
parent element <paper-input-container> instead, once?

[Dan Beam, 2017/01/27 22:50:32]

+1, yeah, that seems cleaner

[Carlson, 2017/01/31 18:39:34]

Good idea, done.

       </paper-icon-button>
     </paper-input-container>
     <iron-dropdown horizontal-align="left" vertical-align="top"
         vertical-offset="47">
       <div class="dropdown-content">
         <template is="dom-repeat" items="[[items]]"
             filter="[[filterItems_(searchTerm_)]]">
           <paper-item on-tap="onSelect_">[[item]]</paper-item>
         </template>
       </div>
@@ skipping 29 matching lines @@
       <div class="body">
         <content select=".dialog-body"></content>
       </div>
       <div class="button-container">
         <content select=".dialog-buttons"></content>
       </div>
     </dialog>
   </template>
   <script src="cups_add_printer_dialog_util.js"></script>
 </dom-module>