Correction of the AEC3 underrun behavior and minor other corrections

webrtc/modules/audio_processing/aec3/aec3_common.h

Index: webrtc/modules/audio_processing/aec3/aec3_common.h
diff --git a/webrtc/modules/audio_processing/aec3/aec3_common.h b/webrtc/modules/audio_processing/aec3/aec3_common.h
index ef7dcdf261bdeefd7d13a66794ece7cadfa1f6f2..f03a7e33d29f25370d39f621679b1cccdfa9f0c1 100644
--- a/webrtc/modules/audio_processing/aec3/aec3_common.h
+++ b/webrtc/modules/audio_processing/aec3/aec3_common.h
@@ -63,7 +63,7 @@ constexpr float kFixedEchoPathGain = 100;
 constexpr size_t kRenderDelayBufferSize =
     (3 * kDownsampledRenderBufferSize) / (4 * kSubBlockSize);
 
-constexpr size_t kMaxApiCallsJitterBlocks = 10;
+constexpr size_t kMaxApiCallsJitterBlocks = 20;

[peah-webrtc, 2017/04/06 13:39:08]

This change adds headroom for larger API jitter which was seen on some
platforms.

 constexpr size_t kRenderTransferQueueSize = kMaxApiCallsJitterBlocks / 2;
 static_assert(2 * kRenderTransferQueueSize >= kMaxApiCallsJitterBlocks,
               "Requirement to ensure buffer overflow detection");