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This test measures CPU and memory when we acquire a HD stream with
WebRTC. The existing local-video.html demo will acquire whatever is the
default, which currently is VGA.

The demo page is taken from our GitHub demo repository and is only
lightly edited to get js paths right.

BUG=413577

Review URL: https://codereview.chromium.org/551863005

Cr-Commit-Position: refs/heads/master@{#296700}