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

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

Index: chrome/browser/resources/print_preview/previewarea/preview_area.js
diff --git a/chrome/browser/resources/print_preview/previewarea/preview_area.js b/chrome/browser/resources/print_preview/previewarea/preview_area.js
index ca06dd84122a92a0d6854a651f76977d59aa6dcf..e43762158302c1f7e52d49e1ed516f5834555d19 100644
--- a/chrome/browser/resources/print_preview/previewarea/preview_area.js
+++ b/chrome/browser/resources/print_preview/previewarea/preview_area.js
@@ -301,11 +301,21 @@ cr.define('print_preview', function() {
 
       // 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.
      */
@@ -564,6 +574,7 @@ cr.define('print_preview', function() {
       } else {
         this.plugin_ = /** @type {print_preview.PDFPlugin} */(
             PDFCreateOutOfProcessPlugin(srcUrl));
+        this.plugin_.setKeyEventCallback(this.keyEventCallback_);
       }
 
       this.plugin_.setAttribute('class', 'preview-area-plugin');