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A new method is added to the Aura shell interface. When client call this
method, the startup ID is set as a property on the Aura window.
This is going to be used to identify a specific virtual machine
applications that a window is for.

TEST: still compile.
Bug: 828147
Change-Id: If86547f4a58ca7793887acfdbb7f6eb0036bf761
Reviewed-on: https://chromium-review.googlesource.com/990791Reviewed-by: David Reveman <reveman@chromium.org>
Commit-Queue: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547985}