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Keep track of the last active terminal by capturing terminal_id
sent from the web app.  When a new process is opened, we call
cicerone GetVshSession to find the container shell pid to set for cwd.

Bug: 1113207
Change-Id: Ia6ff0eb43b9bcefa781f19d141b36143cfd48649
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351644Reviewed-by: Jason Lin <lxj@google.com>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799003}