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We are using the word "sample" in too many ways. Try to move to less
ambiguous terminology.

Bug: 973801
Change-Id: I4d1feeeef22e756e82952e4b53a2a6615dac8715
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510240
Auto-Submit: Asanka Herath <asanka@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Reviewed-by: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823303}