Adding metrics to AEC3

webrtc/modules/audio_processing/aec3/render_delay_controller_metrics_unittest.cc

Index: webrtc/modules/audio_processing/aec3/render_delay_controller_metrics_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/render_delay_controller_metrics_unittest.cc b/webrtc/modules/audio_processing/aec3/render_delay_controller_metrics_unittest.cc
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index 0000000000000000000000000000000000000000..83a57d2ebdb13cc6d0e1a81bea6942d9fbc96eb2
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+++ b/webrtc/modules/audio_processing/aec3/render_delay_controller_metrics_unittest.cc
@@ -0,0 +1,33 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/optional.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_common.h"
+#include "webrtc/modules/audio_processing/aec3/render_delay_controller_metrics.h"
+
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+// Verify the general functionality of RenderDelayControllerMetrics.
+TEST(RenderDelayControllerMetrics, NormalUsage) {
+  RenderDelayControllerMetrics metrics;
+
+  for (int j = 0; j < 3; ++j) {
+    for (int k = 0; k < kMetricsReportingInterval - 1; ++k) {
+      metrics.Update(rtc::Optional<size_t>(), 0);
+      EXPECT_FALSE(metrics.MetricsReported());
+    }
+    metrics.Update(rtc::Optional<size_t>(), 0);
+    EXPECT_TRUE(metrics.MetricsReported());
+  }
+}
+
+}  // namespace webrtc