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This CL makes the browser_tests test launcher initiate and establish a
mojo connection with ash-chrome upon launching lacros-chrome.

Bug: 1120582
Change-Id: I2bc42a837804d988575378799044ea1d582972b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402580Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806835}