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This CL adds a helper script to make it easy to launch lacros-chrome
with mojo connection established to ash-chrome, and the main use case
is to be able to debug lacos-chrome inside a debugger.

Bug: 1120582
Change-Id: Ifddc5fdad44e23dffe9d821424365d89b525dfbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402285
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813316}