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The embedding aura::Window must be attached to a root window so that
window server could figure out the correct display and pass it to the
other side. Deferring the EmbedUsingToken call until RemoteViewHost
is added to a widget.

Bug: 812434
Change-Id: Ie65d12d8b883b1a74426c33c3f106bbb637c0f69
Reviewed-on: https://chromium-review.googlesource.com/998498Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548529}