Process 8 kHz audio as 16 kHz internally of the audio processing module

This CL changes the behavior of APM for 8 kHz so that it is internally
processed as 16 kHz.


Bug: webrtc:10863
Change-Id: Ie17de6551c6e984b60534820374a49ca298f06ce
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/148800
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28929}
diff --git a/modules/audio_processing/audio_processing_unittest.cc b/modules/audio_processing/audio_processing_unittest.cc
index 831799f..461236e 100644
--- a/modules/audio_processing/audio_processing_unittest.cc
+++ b/modules/audio_processing/audio_processing_unittest.cc
@@ -1200,8 +1200,8 @@
 
 TEST_F(ApmTest, NoProcessingWhenAllComponentsDisabledFloat) {
   // Test that ProcessStream copies input to output even with no processing.
-  const size_t kSamples = 80;
-  const int sample_rate = 8000;
+  const size_t kSamples = 160;
+  const int sample_rate = 16000;
   const float src[kSamples] = {-1.0f, 0.0f, 1.0f};
   float dest[kSamples] = {};