Make pinch-zoom work for OOP PDF

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 90 matching lines @@
   // element is sized to fill the entire window and is set to be fixed
   // positioning, acting as a viewport. The plugin renders into this viewport
   // according to the scroll position of the window.
   this.plugin_ = document.createElement('embed');
   // 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);
 
@@ skipping 425 matching lines @@
     } else {
       this.setZoomInProgress_ = false;
     }
   },
 
   /**
    * @private
    * A callback that's called after the viewport changes.
    */
   viewportChanged_: function() {
-    var hasScrollbars = this.viewport_.documentHasScrollbars();
-    var scrollbarWidth = this.viewport_.scrollbarWidth;
-    var verticalScrollbarWidth = hasScrollbars.vertical ? scrollbarWidth : 0;
-    var horizontalScrollbarWidth =
-        hasScrollbars.horizontal ? scrollbarWidth : 0;
-    this.plugin_.style.width =
-        (window.innerWidth - verticalScrollbarWidth) + 'px';
-    this.plugin_.style.height = (window.innerHeight -
-        horizontalScrollbarWidth - this.toolbarHeight_) + 'px';
-
     if (!this.documentDimensions_)
       return;
 
     // Update the buttons selected.
     $('fit-to-page-button').classList.remove('polymer-selected');
     $('fit-to-width-button').classList.remove('polymer-selected');
     if (this.viewport_.fittingType == Viewport.FittingType.FIT_TO_PAGE) {
       $('fit-to-page-button').classList.add('polymer-selected');
     } else if (this.viewport_.fittingType ==
                Viewport.FittingType.FIT_TO_WIDTH) {
       $('fit-to-width-button').classList.add('polymer-selected');
     }
 
     // Offset the toolbar position so that it doesn't move if scrollbars appear.
+    var hasScrollbars = this.viewport_.documentHasScrollbars();
+    var scrollbarWidth = this.viewport_.scrollbarWidth;
+    var verticalScrollbarWidth = hasScrollbars.vertical ? scrollbarWidth : 0;
+    var horizontalScrollbarWidth =
+        hasScrollbars.horizontal ? scrollbarWidth : 0;
     var toolbarRight = Math.max(PDFViewer.MIN_TOOLBAR_OFFSET, scrollbarWidth);
     var toolbarBottom = Math.max(PDFViewer.MIN_TOOLBAR_OFFSET, scrollbarWidth);
     toolbarRight -= verticalScrollbarWidth;
     toolbarBottom -= horizontalScrollbarWidth;
     this.toolbar_.style.right = toolbarRight + 'px';
     this.toolbar_.style.bottom = toolbarBottom + 'px';
     // Hide the toolbar if it doesn't fit in the viewport.
     if (this.toolbar_.offsetLeft < 0 || this.toolbar_.offsetTop < 0)
       this.toolbar_.style.visibility = 'hidden';
     else
@@ skipping 149 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_;
   }
 };