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Changes the effective clock rate by interpolating samples online; does
not require memory allocation. Intended to replace our AudioResampler.

Test: cast_media_unittests
Change-Id: I6563672f936c0d7e9cdf687f42fb42f1bbec1863
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974600
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726628}