Create a common directory of widgets and css.

appengine/chromium_rietveld/new_static/common/cr-view-handler.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. -->
 
 <!--
     Use to make all links in a component view navigation aware. This will trap
     clicks to links in that component and then redirect the navigation to the
     <cr-view> component by dispatching a "navigate" event.
 
     To use just add the component to the <template> inside all components that
@@ skipping 46 matching lines @@
             },
             enclosingTreeScope: function() {
                 var scope = this;
                 while (scope.parentNode)
                     scope = scope.parentNode;
                 return scope;
             },
         });
     </script>
 </polymer-element>