Fixed BubbleBorder sizing problems & added unit tests.

ash/system/web_notification/web_notification_tray.cc

Index: ash/system/web_notification/web_notification_tray.cc
diff --git a/ash/system/web_notification/web_notification_tray.cc b/ash/system/web_notification/web_notification_tray.cc
index 13bf02b48f903afd30a92776c7361d368e1b4b86..27e73b785cd832a54555d288eef53121dd773b4f 100644
--- a/ash/system/web_notification/web_notification_tray.cc
+++ b/ash/system/web_notification/web_notification_tray.cc
@@ -91,8 +91,8 @@ class WebNotificationBubbleWrapper {
     }
     views::TrayBubbleView* bubble_view = views::TrayBubbleView::Create(
         tray->GetBubbleWindowContainer(), anchor, tray, &init_params);
-    bubble_view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
     bubble_wrapper_.reset(new TrayBubbleWrapper(tray, bubble_view));
+    bubble_view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);

[bruthig, 2014/08/26 18:54:28]

My addition of calling UpdateBubble() in
TrayBubbleView::SetArrowPaintType(ArrowPaintType) was causing the
WebNotificationTrayTest.WebNotificationPopupBubble test to seg fault.  This was
happening because a BubbleDelegateView was accessing a null container widget to
compute it's bound before the widget was set.

     bubble->InitializeContents(bubble_view);
   }