again, (1) layout shelf to bottom, (2) snap one window to left, one window to right, (3) layout shelf to left

We could see overlap between two windows.

Shall we make an improvement here?

Deleted: Screenshot from 2017-02-03 15:30:32.png 171 KB

	Screenshot from 2017-02-03 15:30:32.png 171 KB View Download

Deleted: Screenshot from 2017-02-03 15:30:50.png 164 KB

	Screenshot from 2017-02-03 15:30:50.png 164 KB View Download

This is because ChromeOS does not have SplitView yet :)

We have a plan (without details :) to implement real SplitView for Tablet,
although just keeping the half size may be useful.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/81e2da8acdd54eeb8a4485133561c67f1aba5f65

commit 81e2da8acdd54eeb8a4485133561c67f1aba5f65
Author: Qiang Xu <warx@chromium.org>
Date: Fri Dec 08 20:54:01 2017

cros: keep snapped window width ratio against display workarea width

changes:
- Keep snapped window width ratio against display workarea width. The
  ratio is updated on (1) snapped state entered (2) bounds event upon
  snapped state. The ratio is applied on adjusting snapped bounds.
- WindowStateTest.UpdateSnapWidthRatioTest to test above change.
- Add test coverage for  crbug.com/688583 .
- added test coverage for moving (maximized/fullscreen/snapped) window
  to another display.

Bug:  783589 ,  778438 ,  688583 
Test: emulator test and added test coverage
Change-Id: Ibbc3afea87342e75c591c23ecd3a4fded5254cff
Reviewed-on: https://chromium-review.googlesource.com/764114
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522869}
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/display/display_move_window_util_unittest.cc
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/wm/default_state.cc
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/wm/window_state.cc
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/wm/window_state.h
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/wm/window_state_unittest.cc
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/wm/workspace/multi_window_resize_controller_unittest.cc
[modify] https://crrev.com/81e2da8acdd54eeb8a4485133561c67f1aba5f65/ash/wm/workspace/workspace_layout_manager_unittest.cc