Version: ToT
OS: I have seen it on mac bots and repro on my Linux box, so I think it is OS agnostic

What steps will reproduce the problem?
(1) Add some complexity to the render stream in ProcessReverseStreamLocked
(2) compile and run:
./out/Release/webrtc_perf_tests --gtest_filter=AudioProcessingPerformanceTest/CallSimulator.ApiCallDurationTest/* | grep '_capture='
(3) Compare the numbers with and without the additional complexity

What is the expected output?
They should not change.

What do you see instead?
They increase.

Please use labels and text to provide additional information.