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

third_party/polymer/v1_0/components/paper-styles/typography.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
-<!-- TODO(nevir): Should we upgrade Polymer/font-roboto to the final font? -->
-<link rel="stylesheet" href="//fonts.googleapis.com/css?family=Roboto:400,300,300italic,400italic,500,500italic,700,700italic">
 
 <link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../font-roboto/roboto.html">
 
 <style is="custom-style">
 
   :root {
 
     /* Shared Styles */
 
     /*
-    Unfortunately, we can't make use of these yet - sibling properties aren't
-    evaluated. See https://github.com/Polymer/polymer/issues/1399
-
+    Unfortunately, we can't use nested rules
+    See https://github.com/Polymer/polymer/issues/1399
+    */
     --paper-font-common-base: {
       font-family: 'Roboto', 'Noto', sans-serif;
       -webkit-font-smoothing: antialiased;
     };
 
     --paper-font-common-code: {
       font-family: 'Inconsolata', 'Consolas', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
       -webkit-font-smoothing: antialiased;
     };
 
     --paper-font-common-expensive-kerning: {
       text-rendering: optimizeLegibility;
     };
 
     --paper-font-common-nowrap: {
       white-space: nowrap;
       overflow: hidden;
       text-overflow: ellipsis;
     };
-    */
 
     /* Material Font Styles */
 
     --paper-font-display4: {
       /* @apply(--paper-font-common-base) */
       font-family: 'Roboto', 'Noto', sans-serif;
       -webkit-font-smoothing: antialiased;
       /* @apply(--paper-font-common-expensive-kerning); */
       text-rendering: optimizeLegibility;
       /* @apply(--paper-font-common-nowrap); */
@@ skipping 176 matching lines @@
       -webkit-font-smoothing: antialiased;
 
       font-size: 14px;
       font-weight: 500;
       line-height: 20px;
     };
 
   }
 
 </style>