This is basically  Issue 603881  for mac-views-browser. There's a regression test in https://cs.chromium.org/chromium/src/chrome/browser/ui/cocoa/permission_bubble/permission_bubble_cocoa_interactive_uitest.mm (which tests the cocoa and views bubble, but only a cocoa browser). We can probably make that cross-platform.

There's also the much older Issue 319109 which is probably this, same thing on other platforms that is now infecting Mac.

Aand I guess there's also Issue 679339.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d8b301d1cf2685e29c1c6d6dacad7aacac8995d0

commit d8b301d1cf2685e29c1c6d6dacad7aacac8995d0
Author: erikchen <erikchen@chromium.org>
Date: Wed May 30 16:56:13 2018

MacViews: Fix broken hotkeys when permission dialog is showing.

BubbleDialogDelegate was failing to call SetAlwaysRenderAsActive() if the anchor
was set after the visibility callback.

This caused -[NativeWidgetMacNSWindow hasKeyAppearance] of the parent window to
return NO if a bubble window was key. This caused -[CommandDispatcher
bubbleParent] to return nil. And this caused keyEquivalents sent to bubbles to
fail to propagate to the parent window.

Bug:  844571 
Change-Id: I20179a1f432a0cd363b334d6eede30736875f6f7
Reviewed-on: https://chromium-review.googlesource.com/1067860
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562872}
[add] https://crrev.com/d8b301d1cf2685e29c1c6d6dacad7aacac8995d0/chrome/browser/ui/views/permission_bubble/permission_bubble_views_interactive_uitest_mac.mm
[modify] https://crrev.com/d8b301d1cf2685e29c1c6d6dacad7aacac8995d0/chrome/test/BUILD.gn
[modify] https://crrev.com/d8b301d1cf2685e29c1c6d6dacad7aacac8995d0/ui/views/bubble/bubble_dialog_delegate.cc
[modify] https://crrev.com/d8b301d1cf2685e29c1c6d6dacad7aacac8995d0/ui/views/bubble/bubble_dialog_delegate.h
[modify] https://crrev.com/d8b301d1cf2685e29c1c6d6dacad7aacac8995d0/ui/views/bubble/bubble_dialog_delegate_unittest.cc