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Terminal must have dedicated logic to invoke
ShowCrostiniUpdateComponentView.

Most crostini apps start crostini first and show a
spinner whilst this is happening before launching the app.
The crostini startup logic for this case detects
when to show the update component view.

Terminal System App launches immediately so that it can
show the status of crostini starting, so it requires
extra logic.

TerminalSource dummy files have been extended to include
terminal.html and terminal.js which invokes
chrome.terminalPrivate.openTerminalProcess to
test this logic.

Change-Id: I68ec7b769e038947d107024e36312e9c0689f862
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079719
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745359}