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

third_party/polymer/v1_0/components/paper-spinner/paper-spinner.css

 /**
 @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
 
 */
 /**************************/
 /* STYLES FOR THE SPINNER */
 /**************************/
 
 /*
  * Constants:
  *      STROKEWIDTH = 3px
  *      ARCSIZE     = 270 degrees (amount of circle the arc takes up)
  *      ARCTIME     = 1333ms (time it takes to expand and contract arc)
  *      ARCSTARTROT = 216 degrees (how much the start location of the arc
  *                                should rotate each time, 216 gives us a
  *                                5 pointed star shape (it's 360/5 * 3).
  *                                For a 7 pointed star, we might do
  *                                360/7 * 3 = 154.286)
  *      CONTAINERWIDTH = 28px
  *      SHRINK_TIME = 400ms
  */
 
- :host {
+:host {
   display: inline-block;
   position: relative;
   width: 28px; /* CONTAINERWIDTH */
   height: 28px; /* CONTAINERWIDTH */
 }
 
 #spinnerContainer {
   width: 100%;
   height: 100%;
+
+  /* The spinner does not have any contents that would have to be
+   * flipped if the direction changes. Always use ltr so that the
+   * style works out correctly in both cases. */
+  direction: ltr;
 }
 
 #spinnerContainer.active {
   /* duration: 360 * ARCTIME / (ARCSTARTROT + (360-ARCSIZE)) */
   -webkit-animation: container-rotate 1568ms linear infinite;
   animation: container-rotate 1568ms linear infinite;
 }
 
 @-webkit-keyframes container-rotate {
   to { -webkit-transform: rotate(360deg) }
@@ skipping 267 matching lines @@
 
 @-webkit-keyframes fade-out {
   from { opacity: 0.99; }
   to { opacity: 0; }
 }
 
 @keyframes fade-out {
   from { opacity: 0.99; }
   to { opacity: 0; }
 }