[mac bug triage] Assigning to weili@ to have a look

 Issue 840491  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1

commit 7b400d427204a1c6ac816ce361b9ea2a5d8d65e1
Author: Wei Li <weili@chromium.org>
Date: Mon Jun 04 22:06:19 2018

Cmd/Ctrl+Click on a bookmark folder to open all

Click with Command on Mac, or click with control on other platforms, on
a bookmark folder should open all the bookmarks in new background tabs.
This CL adds such action.

In order to test such action, this CL also modified ui controls across
platforms to be able to handle modifier keys for mouse events. The test
added would work across platforms.

BUG= 170072 , 841781 

Change-Id: Idbe1160d7f13f8cec003f086d948252b612276ed
Reviewed-on: https://chromium-review.googlesource.com/1068253
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564258}
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ash/test/ui_controls_factory_ash.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/test/BUILD.gn
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/test/base/interactive_test_utils.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/test/base/interactive_test_utils.h
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/test/base/interactive_test_utils_cocoa.mm
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/chrome/test/base/interactive_test_utils_common_views.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/aura/test/ui_controls_factory_aurawin.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/aura/test/ui_controls_factory_aurax11.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/aura/test/ui_controls_factory_ozone.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls.h
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls_aura.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls_aura.h
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls_internal_win.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls_internal_win.h
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls_mac.mm
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/base/test/ui_controls_win.cc
[modify] https://crrev.com/7b400d427204a1c6ac816ce361b9ea2a5d8d65e1/ui/views/test/ui_controls_factory_desktop_aurax11.cc