OOP PDF: Hide the loading indicator until the plugin loads.

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 384 matching lines @@
         var position = this.viewport_.position;
         if (message.data.x != undefined)
           position.x = message.data.x;
         if (message.data.y != undefined)
           position.y = message.data.y;
         this.viewport_.position = position;
         break;
       case 'setTranslatedStrings':
         this.passwordScreen_.text = message.data.getPasswordString;
         this.progressBar_.text = message.data.loadingString;
+        this.progressBar_.style.visibility = 'visible';
         this.errorScreen_.text = message.data.loadFailedString;
         break;
       case 'cancelStreamUrl':
         chrome.streamsPrivate.abort(this.streamDetails.streamUrl);
         break;
     }
   },
 
   /**
    * @private
@@ skipping 176 matching lines @@
               this.streamDetails.tabId != -1);
   },
 
   /**
    * @type {Viewport} the viewport of the PDF viewer.
    */
   get viewport() {
     return this.viewport_;
   }
 };