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Create a perf test for WSOLA and SincResampler

Project Member Reported by sande...@chromium.org, Aug 17

Issue description

Since this code is significantly affected by CPU optimizations, we should have perf tests covering it.

Tests with silence (including many small but nonzero samples) should be included to cover  issue 531026 .
 
Labels: -Type-Feature Type-Task
Owner: sande...@chromium.org
Probably the remaining places that denormals may effect performance are:
AudioBus::FromInterleaved/ToInterleaved
ChannelMixer::Transform
AudioConverter::Convert
VectorMath::*

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