Switch the background color in PDF Viewer when using Material Design

chrome/browser/resources/pdf/pdf.js

 // 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.
 
 'use strict';
 
 /**
  * @return {number} Width of a scrollbar in pixels
  */
 function getScrollbarWidth() {
@@ skipping 72 matching lines @@
   // NOTE: The plugin's 'id' field must be set to 'plugin' since
   // chrome/renderer/printing/print_web_view_helper.cc actually references it.
   this.plugin_.id = 'plugin';
   this.plugin_.type = 'application/x-google-chrome-pdf';
   this.plugin_.addEventListener('message', this.handlePluginMessage_.bind(this),
                                 false);
   this.plugin_.style.height =
         (window.innerHeight - this.toolbarHeight_) + 'px';
   this.plugin_.style.width = window.innerWidth + 'px';
 
+  if (this.isMaterial_)
+    this.plugin_.setAttribute('is-material', '');
+
   // Handle scripting messages from outside the extension that wish to interact
   // with it. We also send a message indicating that extension has loaded and
   // is ready to receive messages.
   window.addEventListener('message', this.handleScriptingMessage.bind(this),
                           false);
 
   document.title = getFilenameFromURL(this.streamDetails_.originalUrl);
   if (this.isMaterial_)
     $('title').textContent = document.title;
   this.plugin_.setAttribute('src', this.streamDetails_.originalUrl);
@@ skipping 591 matching lines @@
    * Each bookmark is an Object containing a:
    * - title
    * - page (optional)
    * - array of children (themselves bookmarks)
    * @type {Array} the top-level bookmarks of the PDF.
    */
   get bookmarks() {
     return this.bookmarks_;
   }
 };