Make sure ChannelID key is initialized

This test used the test ChannelID key, but it didn't make sure it was
initialized first. This made it appear sometimes depending on the order
the tests were executed.

(cherry picked from commit debfff83084b79b65c092cfe72ebea9d9a9548d6)

Bug: 10210673
Change-Id: I5212e265611208ecb641a7d6b403985df603cb03