Also this Drag&Drop break the first click on any control (include controls in web content). Only second click has effect.

Deleted: screencast 2016-09-14 15-00-39.mp4 2.0 MB

	screencast 2016-09-14 15-00-39.mp4 2.0 MB View Download

Sarah - can you take a look? There's probably some FooFocus() call that needs to be done after a FooEndDrag(). Repro steps in Canary:

0) chrome://flags/#mac-views-webui-dialogs enabled
1) Go to https://httpbin.org/basic-auth/user/passwd
2) Type "one two" in the User Name field
3) Select "two" and drag the selection to before the "one"
4) Click in the password field.

Expected: password field should get focus.
Actual: focus stays in user name field.

The fix for this:
https://codereview.chromium.org/2337233004

I'm a bit concerned how the fix is making changes to ui/base/cocoa/base_view.h since that's being used outside of MacViews.

I think this original change to base_view is outdated by now and no longer needed. 
Original changes: http://codereview.chromium.org/1774014
Now, I can not reproduce BUG= 33100 , without original changes.

May continue discussion in https://codereview.chromium.org/2337233004 ?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/48134b46f0a22980774d9b9cb074e04b4971ada5

commit 48134b46f0a22980774d9b9cb074e04b4971ada5
Author: art-snake <art-snake@yandex-team.ru>
Date: Mon Sep 26 17:51:36 2016

MacViews: Fix sending mouse exit event and releasing capture on D&D.

Currently, clicks immediately after a drag in a MacViews window are
ignored. This is because initiating a drag and drop session with
-[NSView beginDraggingSessionWithItems:..] suppresses the mouse events
that would result in capture being released. To fix, explicitly release
Widget capture before starting the dragging session.

BUG= 646792 

Review-Url: https://codereview.chromium.org/2337233004
Cr-Commit-Position: refs/heads/master@{#420925}

[modify] https://crrev.com/48134b46f0a22980774d9b9cb074e04b4971ada5/ui/views/cocoa/drag_drop_client_mac.mm
[modify] https://crrev.com/48134b46f0a22980774d9b9cb074e04b4971ada5/ui/views/cocoa/drag_drop_client_mac_unittest.mm