Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/paper-toolbar/paper-toolbar.html

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 <link rel="import" href="../polymer/polymer.html">
@@ skipping 34 matching lines @@
     <paper-toolbar class="tall">
       <paper-icon-button icon="menu"></paper-icon-button>
       <div class="middle title">Middle Title</div>
       <div class="bottom title">Bottom Title</div>
     </paper-toolbar>
 
 For `medium-tall` toolbar, the middle and bottom contents overlap and are
 pinned to the bottom.  But `middleJustify` and `bottomJustify` attributes are
 still honored separately.
 
+To make an element completely fit at the bottom of the toolbar, use `fit` along
+with `bottom`.
+
+    <paper-toolbar class="tall">
+      <div id="progressBar" class="bottom fit"></div>
+    </paper-toolbar>
+
 ### Styling
 
 The following custom properties and mixins are available for styling:
 
 Custom property | Description | Default
 ----------------|-------------|----------
 `--paper-toolbar-background` | Toolbar background color     | `--default-primary-color`
 `--paper-toolbar-color`      | Toolbar foreground color     | `--text-primary-color`
 `--paper-toolbar`            | Mixin applied to the toolbar | `{}`
 
@@ skipping 134 matching lines @@
     .toolbar-tools > ::content[select=".middle"] > .title,
     .toolbar-tools > ::content[select=".bottom"] > .title {
       margin-left: 56px;
     }
 
     .toolbar-tools > ::content > paper-icon-button + .title,
     .toolbar-tools > ::content[select=".middle"] paper-icon-button + .title,
     .toolbar-tools > ::content[select=".bottom"] paper-icon-button + .title {
       margin-left: 0;
     }
+
+    .toolbar-tools > ::content > .fit {
+      position: absolute;
+      top: auto;
+      right: 0;
+      bottom: 0;
+      left: 0;
+      width: auto;
+      margin: 0;
+    }
+
   </style>
 
   <template>
 
     <div id="topBar" class$="[[_computeBarClassName(justify)]]">
       <content select=":not(.middle):not(.bottom)"></content>
     </div>
 
     <div id="middleBar" class$="[[_computeBarClassName(middleJustify)]]">
       <content select=".middle"></content>
@@ skipping 116 matching lines @@
             }
           }
         }
         if (labelledBy.length > 0) {
           this.setAttribute('aria-labelledby', labelledBy.join(' '));
         }
       },
 
       _computeBarClassName: function(barJustify) {
         var classObj = {
-          center: true,
-          horizontal: true,
-          layout: true,
+          'center': true,
+          'horizontal': true,
+          'layout': true,
           'toolbar-tools': true
         };
 
         // If a blank string or any falsy value is given, no other class name is
         // added.
         if (barJustify) {
           var justifyClassName = (barJustify === 'justified') ?
               barJustify :
               barJustify + '-justified';
 
           classObj[justifyClassName] = true;
         }
 
         return classNames(classObj);
       }
 
     });
 
   }());
 
 </script>