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Originally, we use background page and chrome.runtime API for
communication between CCA and Tast tests.

However, since SWA does not have background page and cannot use
chrome.runtime API, we introduce a new implementation using
SharedWorker for communication.

Bug: 980846
Test: Tested with the related Tast CL and run "$ tast run [DUT]
camera.CCAUI*"

Change-Id: I575aeb11db4af90de1eebf63ad7f1d8f1608ded2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362235Reviewed-by: Shik Chen <shik@chromium.org>
Reviewed-by: Inker Kuo <inker@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817490}