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This function is splited from LaunchSystemWebApp. It makes it easier for
power users (e.g. terminal settings) to customize launch behavior.

Bug: 1048451
Change-Id: I855faea6f264204953f7fbcaf1cee0e117d76845
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050048
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742047}