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changes:
When window is added to a workspace from another workspace, its current
window bounds possibly is not the original-not-changed-by-user bounds,
for example a resized bounds truncated by available workarea.

Using a member in ash::wm::WindowState to store the windows bounds. It
is used in window added to workspace event from another workspace. It is
set when window is removing from a workspace and it is nullptr (using
pre_auto_manage_window_bounds() if it exists otherwise current window bounds).
It gets reset when window bounds is changed by user.

DisplayMoveWindowUtilTest.KeepWindowBoundsIfNotChangedByUser, also
tested on emulator. Not-user-resized window bounds will not affect the
original bounds when moving between displays.

Bug: 785017, 778438
Test: added the test coverage in
Change-Id: I37d2c79238ea7200b32b5e3a9d5064addc575976
Reviewed-on: https://chromium-review.googlesource.com/770891
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521063}