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

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

Index: third_party/polymer/v1_0/components/paper-toolbar/paper-toolbar.html
diff --git a/third_party/polymer/v1_0/components/paper-toolbar/paper-toolbar.html b/third_party/polymer/v1_0/components/paper-toolbar/paper-toolbar.html
index 153305e27f66df10c7e85a06f21b740bb84ee182..e3c7a03ad1453e90b813340c6faa1cc072f38822 100644
--- a/third_party/polymer/v1_0/components/paper-toolbar/paper-toolbar.html
+++ b/third_party/polymer/v1_0/components/paper-toolbar/paper-toolbar.html
@@ -52,6 +52,13 @@ 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:
@@ -206,6 +213,17 @@ be used as the label of the toolbar via `aria-labelledby`.
     .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>
@@ -342,9 +360,9 @@ be used as the label of the toolbar via `aria-labelledby`.
 
       _computeBarClassName: function(barJustify) {
         var classObj = {
-          center: true,
-          horizontal: true,
-          layout: true,
+          'center': true,
+          'horizontal': true,
+          'layout': true,
           'toolbar-tools': true
         };