The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/32347aea90191f4558531d5dccb05bd9946cddce

commit 32347aea90191f4558531d5dccb05bd9946cddce
Author: oshima <oshima@chromium.org>
Date: Fri Apr 01 17:54:47 2016

Create drag windows on all displays

This refactors and simplify the logic as follows:
* DragWindowDetails is now responsible for drag window state management.
 - DragWindowDetails is created for all displays except for the drag source.
 - This creates/deletes the drag window based on the
requested bounds.
 - This also updates the opacity based on the requested bounds.

This also fixes minor issue in the DragWindowController tests where the window was snapped.

BUG= 598438 
TEST=covered by unit tests.

Review URL: https://codereview.chromium.org/1838003002

Cr-Commit-Position: refs/heads/master@{#384625}

[modify] https://crrev.com/32347aea90191f4558531d5dccb05bd9946cddce/ash/wm/drag_window_controller.cc
[modify] https://crrev.com/32347aea90191f4558531d5dccb05bd9946cddce/ash/wm/drag_window_controller.h
[modify] https://crrev.com/32347aea90191f4558531d5dccb05bd9946cddce/ash/wm/drag_window_resizer.cc
[modify] https://crrev.com/32347aea90191f4558531d5dccb05bd9946cddce/ash/wm/drag_window_resizer.h
[modify] https://crrev.com/32347aea90191f4558531d5dccb05bd9946cddce/ash/wm/drag_window_resizer_unittest.cc

Bulk verified