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diff --git a/media/webrtc/signaling/gtest/Canonicals.h b/media/webrtc/signaling/gtest/Canonicals.h
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+++ b/media/webrtc/signaling/gtest/Canonicals.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MEDIA_WEBRTC_SIGNALING_GTEST_CANONICALS_H_
+#define MEDIA_WEBRTC_SIGNALING_GTEST_CANONICALS_H_
+
+#include "mozilla/gtest/WaitFor.h"
+#include "MediaConduitControl.h"
+#include "MediaPipeline.h"
+
+namespace mozilla {
+
+#define INIT_CANONICAL(name, val) \
+  name(AbstractThread::MainThread(), val, "ConcreteCanonicals::" #name)
+class ConcreteCanonicals {
+ public:
+  ConcreteCanonicals()
+      : INIT_CANONICAL(mReceiving, false),
+        INIT_CANONICAL(mTransmitting, false),
+        INIT_CANONICAL(mLocalSsrcs, Ssrcs()),
+        INIT_CANONICAL(mLocalVideoRtxSsrcs, Ssrcs()),
+        INIT_CANONICAL(mLocalCname, std::string()),
+        INIT_CANONICAL(mMid, std::string()),
+        INIT_CANONICAL(mSyncGroup, std::string()),
+        INIT_CANONICAL(mLocalSendRtpExtensions, RtpExtList()),
+        INIT_CANONICAL(mLocalRecvRtpExtensions, RtpExtList()),
+        INIT_CANONICAL(mRemoteSsrc, 0),
+        INIT_CANONICAL(mRemoteVideoRtxSsrc, 0),
+        INIT_CANONICAL(mFrameTransformerProxySend, nullptr),
+        INIT_CANONICAL(mFrameTransformerProxyRecv, nullptr),
+        INIT_CANONICAL(mAudioRecvCodecs, std::vector<AudioCodecConfig>()),
+        INIT_CANONICAL(mAudioSendCodec, Nothing()),
+        INIT_CANONICAL(mVideoRecvCodecs, std::vector<VideoCodecConfig>()),
+        INIT_CANONICAL(mVideoSendCodec, Nothing()),
+        INIT_CANONICAL(mVideoRecvRtpRtcpConfig, Nothing()),
+        INIT_CANONICAL(mVideoSendRtpRtcpConfig, Nothing()),
+        INIT_CANONICAL(mVideoCodecMode,
+                       webrtc::VideoCodecMode::kRealtimeVideo) {}
+
+  Canonical<bool> mReceiving;
+  Canonical<bool> mTransmitting;
+  Canonical<Ssrcs> mLocalSsrcs;
+  Canonical<Ssrcs> mLocalVideoRtxSsrcs;
+  Canonical<std::string> mLocalCname;
+  Canonical<std::string> mMid;
+  Canonical<std::string> mSyncGroup;
+  Canonical<RtpExtList> mLocalSendRtpExtensions;
+  Canonical<RtpExtList> mLocalRecvRtpExtensions;
+  Canonical<Ssrc> mRemoteSsrc;
+  Canonical<Ssrc> mRemoteVideoRtxSsrc;
+  Canonical<RefPtr<FrameTransformerProxy>> mFrameTransformerProxySend;
+  Canonical<RefPtr<FrameTransformerProxy>> mFrameTransformerProxyRecv;
+
+  Canonical<std::vector<AudioCodecConfig>> mAudioRecvCodecs;
+  Canonical<Maybe<AudioCodecConfig>> mAudioSendCodec;
+  MediaEventProducer<DtmfEvent> mDtmfEvent;
+
+  Canonical<std::vector<VideoCodecConfig>> mVideoRecvCodecs;
+  Canonical<Maybe<VideoCodecConfig>> mVideoSendCodec;
+  Canonical<Maybe<RtpRtcpConfig>> mVideoRecvRtpRtcpConfig;
+  Canonical<Maybe<RtpRtcpConfig>> mVideoSendRtpRtcpConfig;
+  Canonical<webrtc::VideoCodecMode> mVideoCodecMode;
+};
+#undef INIT_CANONICAL
+
+class ConcreteControl : public AudioConduitControlInterface,
+                        public VideoConduitControlInterface,
+                        public MediaPipelineReceiveControlInterface,
+                        public MediaPipelineTransmitControlInterface,
+                        private ConcreteCanonicals {
+ private:
+  RefPtr<nsISerialEventTarget> mTarget;
+
+ public:
+  explicit ConcreteControl(RefPtr<nsISerialEventTarget> aTarget)
+      : mTarget(std::move(aTarget)) {}
+
+  template <typename Function>
+  void Update(Function aFunction) {
+    mTarget->Dispatch(NS_NewRunnableFunction(
+        __func__, [&] { aFunction(*static_cast<ConcreteCanonicals*>(this)); }));
+    WaitForMirrors(mTarget);
+  }
+
+  // MediaConduitControlInterface
+  // -- MediaPipelineReceiveControlInterface
+  Canonical<bool>& CanonicalReceiving() override { return mReceiving; }
+  // -- MediaPipelineTransmitControlInterface
+  Canonical<bool>& CanonicalTransmitting() override { return mTransmitting; }
+  Canonical<Ssrcs>& CanonicalLocalSsrcs() override { return mLocalSsrcs; }
+  Canonical<Ssrcs>& CanonicalLocalVideoRtxSsrcs() override {
+    return mLocalVideoRtxSsrcs;
+  }
+  Canonical<std::string>& CanonicalLocalCname() override { return mLocalCname; }
+  Canonical<std::string>& CanonicalMid() override { return mMid; }
+  Canonical<Ssrc>& CanonicalRemoteSsrc() override { return mRemoteSsrc; }
+  Canonical<Ssrc>& CanonicalRemoteVideoRtxSsrc() override {
+    return mRemoteVideoRtxSsrc;
+  }
+  Canonical<std::string>& CanonicalSyncGroup() override { return mSyncGroup; }
+  Canonical<RtpExtList>& CanonicalLocalRecvRtpExtensions() override {
+    return mLocalRecvRtpExtensions;
+  }
+  Canonical<RtpExtList>& CanonicalLocalSendRtpExtensions() override {
+    return mLocalSendRtpExtensions;
+  }
+  Canonical<RefPtr<FrameTransformerProxy>>& CanonicalFrameTransformerProxySend()
+      override {
+    return mFrameTransformerProxySend;
+  }
+  Canonical<RefPtr<FrameTransformerProxy>>& CanonicalFrameTransformerProxyRecv()
+      override {
+    return mFrameTransformerProxyRecv;
+  }
+
+  // AudioConduitControlInterface
+  Canonical<Maybe<AudioCodecConfig>>& CanonicalAudioSendCodec() override {
+    return mAudioSendCodec;
+  }
+  Canonical<std::vector<AudioCodecConfig>>& CanonicalAudioRecvCodecs()
+      override {
+    return mAudioRecvCodecs;
+  }
+  MediaEventSource<DtmfEvent>& OnDtmfEvent() override { return mDtmfEvent; }
+
+  // VideoConduitControlInterface
+  Canonical<Maybe<VideoCodecConfig>>& CanonicalVideoSendCodec() override {
+    return mVideoSendCodec;
+  }
+  Canonical<Maybe<RtpRtcpConfig>>& CanonicalVideoSendRtpRtcpConfig() override {
+    return mVideoSendRtpRtcpConfig;
+  }
+  Canonical<std::vector<VideoCodecConfig>>& CanonicalVideoRecvCodecs()
+      override {
+    return mVideoRecvCodecs;
+  }
+  Canonical<Maybe<RtpRtcpConfig>>& CanonicalVideoRecvRtpRtcpConfig() override {
+    return mVideoRecvRtpRtcpConfig;
+  }
+  Canonical<webrtc::VideoCodecMode>& CanonicalVideoCodecMode() override {
+    return mVideoCodecMode;
+  }
+};
+
+}  // namespace mozilla
+
+#endif