The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3fa2f4f2fe52f652837a96928cf525d4081004ad

commit 3fa2f4f2fe52f652837a96928cf525d4081004ad
Author: juncai <juncai@chromium.org>
Date: Fri Jul 29 18:02:32 2016

Chooser spinner should disappear as soon as one device shows up

The chooser needs to show devices as they come. So the spinner should
disappear as soon as one device shows up. This can reduce the wait time
and user can select a device more quickly if it is already listed in
the chooser.

I added some screenshots at  issue 583452 .

BUG= 583452 ,  632173 

Review-Url: https://codereview.chromium.org/2192953002
Cr-Commit-Position: refs/heads/master@{#408687}

[modify] https://crrev.com/3fa2f4f2fe52f652837a96928cf525d4081004ad/chrome/browser/chooser_controller/OWNERS
[modify] https://crrev.com/3fa2f4f2fe52f652837a96928cf525d4081004ad/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
[modify] https://crrev.com/3fa2f4f2fe52f652837a96928cf525d4081004ad/chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller_unittest.mm
[modify] https://crrev.com/3fa2f4f2fe52f652837a96928cf525d4081004ad/chrome/browser/ui/views/chooser_content_view.cc
[modify] https://crrev.com/3fa2f4f2fe52f652837a96928cf525d4081004ad/chrome/browser/ui/views/chooser_content_view_unittest.cc
[modify] https://crrev.com/3fa2f4f2fe52f652837a96928cf525d4081004ad/chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc