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When session restore rebuilds the session restore commands, it was
losing the workspace because it wasn't adding the workspace command to
the list of rebuilt commands. This is most noticeable if you have a lot
of windows open on different workspaces/virtual desktops.

This CL also makes BrowserDesktopWindowTreeHostWin update the workspace
on ::Show, if the workspace isn't set. This makes opening a new browser
window immediately update the workspace, so it will be restored
on session restore without the user having to focus the window.

Bug: 1150225
Change-Id: I38ab861147041f4557e5ae8b62ec0c04763f1f4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585990
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837137}