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

third_party/polymer/v1_0/components-chromium/paper-styles/classes/shadow.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
 -->
 
 <style>
 .shadow-transition {
   transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
 }
 
-.shadow-elevation-1 {
-  box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.37);
+.shadow-elevation-2dp {
+  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14),
+              0 1px 5px 0 rgba(0, 0, 0, 0.12),
+              0 3px 1px -2px rgba(0, 0, 0, 0.2);
 }
 
-.shadow-elevation-2 {
-  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.2),
-              0 6px 10px 0 rgba(0, 0, 0, 0.3);
+.shadow-elevation-3dp {
+  box-shadow: 0 3px 4px 0 rgba(0, 0, 0, 0.14),
+              0 1px 8px 0 rgba(0, 0, 0, 0.12),
+              0 3px 3px -2px rgba(0, 0, 0, 0.4);
 }
 
-.shadow-elevation-3 {
-  box-shadow: 0 11px 7px 0 rgba(0, 0, 0, 0.19),
-              0 13px 25px 0 rgba(0, 0, 0, 0.3);
+.shadow-elevation-4dp {
+  box-shadow: 0 4px 5px 0 rgba(0, 0, 0, 0.14),
+              0 1px 10px 0 rgba(0, 0, 0, 0.12),
+              0 2px 4px -1px rgba(0, 0, 0, 0.4);
 }
 
-.shadow-elevation-4 {
-  box-shadow: 0 14px 12px 0 rgba(0, 0, 0, 0.17),
-              0 20px 40px 0 rgba(0, 0, 0, 0.3);
+.shadow-elevation-6dp {
+  box-shadow: 0 6px 10px 0 rgba(0, 0, 0, 0.14),
+              0 1px 18px 0 rgba(0, 0, 0, 0.12),
+              0 3px 5px -1px rgba(0, 0, 0, 0.4);
 }
 
-.shadow-elevation-5 {
-  box-shadow: 0 17px 17px 0 rgba(0, 0, 0, 0.15),
-              0 27px 55px 0 rgba(0, 0, 0, 0.3);
+.shadow-elevation-8dp {
+  box-shadow: 0 8px 10px 1px rgba(0, 0, 0, 0.14),
+              0 3px 14px 2px rgba(0, 0, 0, 0.12),
+              0 5px 5px -3px rgba(0, 0, 0, 0.4);
 }
+
+.shadow-elevation-16dp {
+  box-shadow: 0 16px 24px 2px rgba(0, 0, 0, 0.14),
+              0  6px 30px 5px rgba(0, 0, 0, 0.12),
+              0  8px 10px -5px rgba(0, 0, 0, 0.4);
+}
+
 </style>