Return ShelfDisplayBoundsI in root coordinates

Most use case is in root coordinates, and GetDisplayNearestWindow can return wrong value during transition.

I also disabled a few tests on Windows as the window may not be resized on Win Ash. (besides, win_ash will be gone soon)

BUG=547280
TEST=WindowTreeHostTest.ReplacePrimary

Review URL: https://codereview.chromium.org/1419373004

Cr-Commit-Position: refs/heads/master@{#357730}
9 files changed