Adds fuzzer for the residual echo detector.

webrtc/test/fuzzers/BUILD.gn

Index: webrtc/test/fuzzers/BUILD.gn
diff --git a/webrtc/test/fuzzers/BUILD.gn b/webrtc/test/fuzzers/BUILD.gn
index 9153cbc366037ac3da2987a90bc17bd0e5a0004f..33c2c4792b450632c961b5cccdf469fd79aef6a1 100644
--- a/webrtc/test/fuzzers/BUILD.gn
+++ b/webrtc/test/fuzzers/BUILD.gn
@@ -266,6 +266,16 @@ webrtc_fuzzer_test("neteq_rtp_fuzzer") {
   ]
 }
 
+webrtc_fuzzer_test("residual_echo_detector_fuzzer") {
+  sources = [
+    "residual_echo_detector_fuzzer.cc",
+  ]
+  deps = [
+    "../../base:rtc_base_approved",
+    "../../modules/audio_processing:audio_processing",
+  ]
+}
+
 webrtc_fuzzer_test("sdp_parser_fuzzer") {
   sources = [
     "sdp_parser_fuzzer.cc",