OOP PDF: Allow print preview to handle key events when the plugin has focus

chrome/browser/resources/print_preview/previewarea/preview_area.js

 // Copyright (c) 2012 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.
 
 /**
  * @typedef {{accessibility: Function,
  *            documentLoadComplete: Function,
  *            getHeight: Function,
  *            getHorizontalScrollbarThickness: Function,
  *            getPageLocationNormalized: Function,
@@ skipping 283 matching lines @@
       while (element) {
         if (element.scrollHeight > element.clientHeight ||
             element.scrollWidth > element.clientWidth) {
           return;
         }
         element = element.parentElement;
       }
 
       // No scroll bar anywhere, or the active element is something else, like a
       // button. Note: buttons have a bigger scrollHeight than clientHeight.
-      this.plugin_.sendKeyEvent(e.keyCode);
+      this.plugin_.sendKeyEvent(e);
       e.preventDefault();
     },
 
     /**
+     * Set a callback that gets called when a key event is received that
+     * originates in the plugin.
+     * @param {function(Event)} callback The callback to be called with a key
+     *     event.
+     */
+    setPluginKeyEventCallback: function(callback) {
+      this.keyEventCallback_ = callback;
+    },
+
+    /**
      * Shows a custom message on the preview area's overlay.
      * @param {string} message Custom message to show.
      */
     showCustomMessage: function(message) {
       this.showMessage_(PreviewArea.MessageId_.CUSTOM, message);
     },
 
     /** @override */
     enterDocument: function() {
       print_preview.Component.prototype.enterDocument.call(this);
@@ skipping 238 matching lines @@
 
       if (this.pluginType_ == PreviewArea.PluginType_.IN_PROCESS) {
         this.plugin_ = assertInstanceof(document.createElement('embed'),
                                         HTMLEmbedElement);
         this.plugin_.setAttribute(
             'type', 'application/x-google-chrome-print-preview-pdf');
         this.plugin_.setAttribute('src', srcUrl);
       } else {
         this.plugin_ = /** @type {print_preview.PDFPlugin} */(
             PDFCreateOutOfProcessPlugin(srcUrl));
+        this.plugin_.setKeyEventCallback(this.keyEventCallback_);
       }
 
       this.plugin_.setAttribute('class', 'preview-area-plugin');
       this.plugin_.setAttribute('aria-live', 'polite');
       this.plugin_.setAttribute('aria-atomic', 'true');
       // NOTE: The plugin's 'id' field must be set to 'pdf-viewer' since
       // chrome/renderer/printing/print_web_view_helper.cc actually references
       // it.
       this.plugin_.setAttribute('id', 'pdf-viewer');
       this.getChildElement('.preview-area-plugin-wrapper').
@@ skipping 234 matching lines @@
       // being draggable.
       this.plugin_.style.pointerEvents = isDragging ? 'none' : 'auto';
     }
   };
 
   // Export
   return {
     PreviewArea: PreviewArea
   };
 });