Roll Polymer to 1.3.1

third_party/polymer/v1_0/components-chromium/paper-spinner/paper-spinner-styles.html

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 <dom-module id="paper-spinner-styles">
   <template>
     <style>
       /*
       /**************************/
       /* 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
        */
@@ skipping 227 matching lines @@
         border-color: inherit;
       }
 
       .circle-clipper .circle {
         width: 200%;
       }
 
       .circle {
         box-sizing: border-box;
         height: 100%;
-        border-width: 3px; /* STROKEWIDTH */
+        border-width: var(--paper-spinner-stroke-width, 3px); /* STROKEWIDTH */
         border-style: solid;
         border-color: inherit;
         border-bottom-color: transparent !important;
         border-radius: 50%;
         -webkit-animation: none;
         animation: none;
 
         @apply(--layout-fit);
       }
 
@@ skipping 57 matching lines @@
         to { opacity: 0; }
       }
 
       @keyframes fade-out {
         from { opacity: 0.99; }
         to { opacity: 0; }
       }
     </style>
   </template>
 </dom-module>