I'm attaching screenshots of views_examples without and with https://chromium-review.googlesource.com/c/chromium/src/+/1386432 patch. Only cases not previously handled have changed.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5499c0794054577e184a73245e0f435e219e5cdb

commit 5499c0794054577e184a73245e0f435e219e5cdb
Author: Tomasz Moniuszko <tmoniuszko@opera.com>
Date: Thu Jan 03 08:24:32 2019

Handle missing anchor positions for BubbleBorder bounds calculation

Bug:  918516 
Change-Id: Id97aac57ef7e4bc64e312712068d8500f1d2f4e2
Reviewed-on: https://chromium-review.googlesource.com/c/1386432
Commit-Queue: Tomasz Moniuszko <tmoniuszko@opera.com>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619602}
[modify] https://crrev.com/5499c0794054577e184a73245e0f435e219e5cdb/ui/views/bubble/bubble_border.cc
[modify] https://crrev.com/5499c0794054577e184a73245e0f435e219e5cdb/ui/views/bubble/bubble_border_unittest.cc