Add page indicator and progress bar polymer elements

elements/viewer-progress-bar/viewer-progress-bar.css

+/* Copyright 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+:host {
+  -webkit-transition: opacity 400ms ease-in-out;
+  background: rgb(29, 39, 57);
+  border-radius: 5px;
+  bottom: 26px;
+  box-shadow: 0 1px 2px gray, 0 3px 3px rgba(0, 0, 0, .2);
+  height: auto;
+  left: 26px;
+  position: fixed;
+  width: auto;
+}
+
+.scaler {
+  -webkit-transform: scale(0.25);
+  -webkit-transform-origin: 0 0;
+  float: left;
+  height: 44px;
+  margin: 8px;
+  width: 44px;
+}
+
+#segments {
+  border-radius: 50%;
+  height: 176px;
+  list-style: none;
+  margin: 0;
+  overflow: hidden;
+  padding: 0;
+  position: absolute;
+  width: 176px;
+}
+
+.segment {
+  -webkit-transform-origin: 0 100%;
+  background: rgb(227, 234, 249);
+  box-shadow: 0 0 0 6px rgb(29, 39, 57) inset;
+  height: 50%;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  top: 0;
+  width: 50%;
+}
+
+.segment:nth-child(1) {
+  -webkit-transform: rotate(0) skewY(-45deg);
+}
+
+.segment:nth-child(2) {
+  -webkit-transform: rotate(45deg) skewY(-45deg);
+}
+
+.segment:nth-child(3) {
+  -webkit-transform: rotate(90deg) skewY(-45deg);
+}
+
+.segment:nth-child(4) {
+  -webkit-transform: rotate(135deg) skewY(-45deg);
+}
+
+.segment:nth-child(5) {
+  -webkit-transform: rotate(180deg) skewY(-45deg);
+}
+
+.segment:nth-child(6) {
+  -webkit-transform: rotate(225deg) skewY(-45deg);
+}
+
+.segment:nth-child(7) {
+  -webkit-transform: rotate(270deg) skewY(-45deg);
+}
+
+.segment:nth-child(8) {
+  -webkit-transform: rotate(315deg) skewY(-45deg);
+}
+
+.center-circle {
+  background-color: rgb(29, 39, 57);
+  border-radius: 50%;
+  height: 80px;
+  left: 44px;
+  margin: 0;
+  padding: 0;
+  position: absolute;
+  top: 44px;
+  width: 80px;
+}
+
+#text {
+  color: rgb(227, 234, 249);
+  float: left;
+  font-family: sans-serif;
+  font-size: 16px;
+  font-weight: bold;
+  line-height: 58px;
+  margin-right: 10px;
+  margin-top: 1px;
+}