Adding metrics to AEC3

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 3a5e835e21d3b782fe2eb971ea7a7b8f1bda93f2..1d4a9feba1e8fd67762a4921e2663b55353e1e56 100644
--- a/webrtc/modules/audio_processing/aec3/aec3_common.h
+++ b/webrtc/modules/audio_processing/aec3/aec3_common.h
@@ -26,6 +26,11 @@ namespace webrtc {
 
 enum class Aec3Optimization { kNone, kSse2 };
 
+constexpr int kMetricsReportingIntervalBlocks = 10 * 250;
+constexpr int kMetricsComputationBlocks = 9;
+constexpr int kMetricsCollectionBlocks =
+    kMetricsReportingIntervalBlocks - kMetricsComputationBlocks;
+
 constexpr size_t kFftLengthBy2 = 64;
 constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1;
 constexpr size_t kFftLengthBy2Minus1 = kFftLengthBy2 - 1;