Create a common directory of widgets and css.

appengine/chromium_rietveld/new_static/components/cr-settings-editor.html

 <!-- Copyright (c) 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
 
 <polymer-element name="cr-settings-editor" attributes="settings errors disabled">
     <template>
-        <link rel="stylesheet" href="common.css">
-        <link rel="stylesheet" href="forms.css">
+        <link rel="stylesheet" href="../common/common.css">
+        <link rel="stylesheet" href="../common/forms.css">
 
         <fieldset class="form-fields" disabled?="{{ disabled }}">
             <div class="form-row">
                 <label class="form-label" for="name">Name</label>
                 <div class="form-field">
                     <input type="text" id="name" value="{{ settings.name }}" autocomplete="off" class="{{ {invalid: errors.name} | tokenList }}">
                     <div class="form-error">{{ errors.name }}</div>
                 </div>
             </div>
             <div class="form-row">
@@ skipping 29 matching lines @@
     <script>
         Polymer("cr-settings-editor", {
             created: function() {
                 this.settings = null;
                 this.errors = {};
                 this.disabled = false;
             },
         });
     </script>
 </polymer-element>