Don't use barcodes in ProtocolPerfTests

Previously the perf tests were using a unique barcode to identify video
frames when measuring latency. This is not longer necessary. Now the
tests will use fake input event timestamps and video stats messages to
measure latency.

Committed: https://crrev.com/69d9c4d4f5a66e0f7bcf02c40058d7d2e122300b
Review-Url: https://codereview.chromium.org/2420183002
Cr-Original-Commit-Position: refs/heads/master@{#425895}
Cr-Commit-Position: refs/heads/master@{#425998}
12 files changed