GuestView: Use computed size if getBoundingClientRect() size is unavailable.

extensions/renderer/resources/guest_view/guest_view_container.js

Index: extensions/renderer/resources/guest_view/guest_view_container.js
diff --git a/extensions/renderer/resources/guest_view/guest_view_container.js b/extensions/renderer/resources/guest_view/guest_view_container.js
index 35c6991039cec6152b94e483f75a1c3e0cc547fa..a0df2a56470265ec6db5b5dc7dc0fa4eee4fb2d5 100644
--- a/extensions/renderer/resources/guest_view/guest_view_container.js
+++ b/extensions/renderer/resources/guest_view/guest_view_container.js
@@ -157,9 +157,12 @@ GuestViewContainer.prototype.onElementResize = function(oldWidth, oldHeight,
 GuestViewContainer.prototype.buildParams = function() {
   var params = this.buildContainerParams();
   params['instanceId'] = this.viewInstanceId;
+  var css = window.getComputedStyle(this.element, null);

[paulmeyer, 2015/03/24 20:57:00]

I think it would be useful to add a comment here about why both the bounding
rect and the computed style properties are needed here. Otherwise later on
someone might see this and think they can just remove one or the other.

[Fady Samuel, 2015/03/26 17:50:38]

Done.

   var elementRect = this.element.getBoundingClientRect();
-  params['elementWidth'] = parseInt(elementRect.width);
-  params['elementHeight'] = parseInt(elementRect.height);
+  params['elementWidth'] = parseInt(elementRect.width) ||
+      parseInt(css.getPropertyValue('width'));
+  params['elementHeight'] = parseInt(elementRect.height) ||
+      parseInt(css.getPropertyValue('height'));
   return params;
 };