Re-Land: Implement AudioReceiveStream::GetStats().

R=tommi@webrtc.org
BUG=webrtc:4690

Committed: https://chromium.googlesource.com/external/webrtc/+/a457752f4afc496ed7f4d6b584b08d8635f18cc0

Review URL: https://codereview.webrtc.org/1390753002 .

Cr-Commit-Position: refs/heads/master@{#10369}
diff --git a/webrtc/test/call_test.h b/webrtc/test/call_test.h
index 2b9dcee..4a645b4 100644
--- a/webrtc/test/call_test.h
+++ b/webrtc/test/call_test.h
@@ -52,6 +52,7 @@
                    const Call::Config& receiver_config);
   void CreateSenderCall(const Call::Config& config);
   void CreateReceiverCall(const Call::Config& config);
+  void DestroyCalls();
 
   void CreateSendConfig(size_t num_streams, Transport* send_transport);
   void CreateMatchingReceiveConfigs(Transport* rtcp_send_transport);