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This patch adds a helper for setting up the environment necessary to
unit test communication with Android apps. At this time, only the
Android subsystem on Chrome OS has a concrete implementation.

Bug: 1061503
Change-Id: I6900aa13cd111d14adeaab6a0116a623c4ace817
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250351
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797802}