Can you take a look, patricialor@?

The problem is that the bubble is being shown without its parent (the anchor widget) having ever being shown in the first place, which passes on Aura because of  crbug.com/590957 , which was picked up earlier by a similar test failing on MacViews.

Will send out a CL for a simple fix which is just to show the anchor widget before the bubble.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bfe263607137b4c4af5cb42fcf9a2d6cb7cc4183

commit bfe263607137b4c4af5cb42fcf9a2d6cb7cc4183
Author: patricialor <patricialor@chromium.org>
Date: Thu Apr 21 08:22:42 2016

MacViews: Fix BubbleDialogDelegateTest.CloseMethods

BubbleDialogDelegateTest.CloseMethods, added in http://crrev.com/1809933003
(r382045) fails on MacViews because bubbles cannot be shown unless their parents
are already visible. This is expected behaviour, so fix it by showing the parent
anchor widget immediately after creation (which affects all tests calling
CreateTestWidget()).

Note this test passes on Aura because of  http://crbug.com/590957 .

BUG= 590957 ,  600921 

Review URL: https://codereview.chromium.org/1891823004

Cr-Commit-Position: refs/heads/master@{#388720}

[modify] https://crrev.com/bfe263607137b4c4af5cb42fcf9a2d6cb7cc4183/ui/views/bubble/bubble_dialog_delegate_unittest.cc