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The new test case verifies that pipeline initialization of encrypted
playback waits for a CDM to be set, and a CDM that doesn't support a
Decryptor or a valid CDM ID will cause initialization error.

Bug: 1018854
Test: New test cases
Change-Id: I67fe51fb5012059533a5113ac929b89f47fdfe29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885022Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711590}