Added the onResize and onContentResize events to GuestViewEvents.

extensions/renderer/resources/guest_view/guest_view_events.js

Index: extensions/renderer/resources/guest_view/guest_view_events.js
diff --git a/extensions/renderer/resources/guest_view/guest_view_events.js b/extensions/renderer/resources/guest_view/guest_view_events.js
index 415d0c4326df4ca4562839829a3244839d7b0f98..714cf47036f15cba1334546a52d91aefd91f52fd 100644
--- a/extensions/renderer/resources/guest_view/guest_view_events.js
+++ b/extensions/renderer/resources/guest_view/guest_view_events.js
@@ -15,6 +15,10 @@ function GuestViewEvents(view) {
   this.view = view;
   this.on = {};
 
+  // |setupEventProperty| is normally called automatically, but the
+  // 'resize' event is registered here because the event is fired from
+  // GuestViewContainer instead of in response to an extension event.
+  this.setupEventProperty('resize');
   this.setupEvents();
 }
 
@@ -36,7 +40,12 @@ function GuestViewEvents(view) {
 //     should be dispatched within this handler function (if desired). With no
 //     handler function, the DOM event will be dispatched by default each time
 //     the extension event is caught.
-GuestViewEvents.EVENTS = {};
+GuestViewEvents.EVENTS = {
+  'contentresize': {
+    evt: CreateEvent('guestViewInternal.onContentResize'),
+    fields: ['oldWidth', 'oldHeight', 'newWidth', 'newHeight']
+  }
+};
 
 // Sets up the handling of events.
 GuestViewEvents.prototype.setupEvents = function() {