Merge html-office-public repo into src

chrome/browser/resources/pdf/elements/viewer-button/viewer-button.js

+// Copyright 2014 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.
+
+(function() {
+  var dpi = '';
+
+  Polymer('viewer-button', {
+    img: '',
+    latchable: false,
+    ready: function() {
+      if (!dpi) {
+        var mql = window.matchMedia('(-webkit-min-device-pixel-ratio: 1.3');
+        dpi = mql.matches ? 'hi' : 'low';
+      }
+    },
+    imgChanged: function() {
+      if (this.img) {
+        this.$.icon.style.backgroundImage =
+            'url(' + this.getAttribute('assetpath') + 'img/' + dpi +
+            'DPI/' + this.img + ')';
+      } else {
+        this.$.icon.style.backgroundImage = '';
+      }
+    },
+    latchableChanged: function() {
+      if (this.latchable)
+        this.classList.add('latchable');
+      else
+        this.classList.remove('latchable');
+    },
+  });
+})();