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This change adds a test to exercice the persistent-usage-record path
for EME. The new test create a PUR session and wait for the video to
end and verify that the license-release message contain the usage
record.

Bug: 1091502
Change-Id: I2d6347f39981d9eb1025d37ced254eb6aae766b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285250Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Alex St-Onge <alstonge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788870}