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diff --git a/Source/WebCore/Modules/mediastream/PeerConnectionBackend.cpp b/Source/WebCore/Modules/mediastream/PeerConnectionBackend.cpp
new file mode 100644
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+++ b/Source/WebCore/Modules/mediastream/PeerConnectionBackend.cpp
@@ -0,0 +1,312 @@
+/*
+ * Copyright (C) 2015 Ericsson AB. All rights reserved.
+ * Copyright (C) 2016 Apple INC. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name of Ericsson nor the names of its contributors
+ *    may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "PeerConnectionBackend.h"
+
+#if ENABLE(WEB_RTC)
+
+#include "EventNames.h"
+#include "JSRTCSessionDescription.h"
+#include "RTCIceCandidate.h"
+#include "RTCIceCandidateEvent.h"
+#include "RTCPeerConnection.h"
+
+namespace WebCore {
+
+void PeerConnectionBackend::createOffer(RTCOfferOptions&& options, PeerConnection::SessionDescriptionPromise&& promise)
+{
+    ASSERT(!m_offerAnswerPromise);
+    ASSERT(m_peerConnection.internalSignalingState() != PeerConnectionStates::SignalingState::Closed);
+
+    m_offerAnswerPromise = WTFMove(promise);
+    doCreateOffer(WTFMove(options));
+}
+
+void PeerConnectionBackend::createOfferSucceeded(String&& sdp)
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_offerAnswerPromise);
+    m_offerAnswerPromise->resolve(RTCSessionDescription::create(RTCSessionDescription::SdpType::Offer, WTFMove(sdp)));
+    m_offerAnswerPromise = std::nullopt;
+}
+
+void PeerConnectionBackend::createOfferFailed(Exception&& exception)
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_offerAnswerPromise);
+    m_offerAnswerPromise->reject(WTFMove(exception));
+    m_offerAnswerPromise = std::nullopt;
+}
+
+void PeerConnectionBackend::createAnswer(RTCAnswerOptions&& options, PeerConnection::SessionDescriptionPromise&& promise)
+{
+    ASSERT(!m_offerAnswerPromise);
+    ASSERT(m_peerConnection.internalSignalingState() != PeerConnectionStates::SignalingState::Closed);
+
+    m_offerAnswerPromise = WTFMove(promise);
+    doCreateAnswer(WTFMove(options));
+}
+
+void PeerConnectionBackend::createAnswerSucceeded(String&& sdp)
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_offerAnswerPromise);
+    m_offerAnswerPromise->resolve(RTCSessionDescription::create(RTCSessionDescription::SdpType::Answer, WTFMove(sdp)));
+    m_offerAnswerPromise = std::nullopt;
+}
+
+void PeerConnectionBackend::createAnswerFailed(Exception&& exception)
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_offerAnswerPromise);
+    m_offerAnswerPromise->reject(WTFMove(exception));
+    m_offerAnswerPromise = std::nullopt;
+}
+
+static inline bool isLocalDescriptionTypeValidForState(RTCSessionDescription::SdpType type, PeerConnectionStates::SignalingState state)
+{
+    switch (state) {
+    case PeerConnectionStates::SignalingState::Stable:
+        return type == RTCSessionDescription::SdpType::Offer;
+    case PeerConnectionStates::SignalingState::HaveLocalOffer:
+        return type == RTCSessionDescription::SdpType::Offer;
+    case PeerConnectionStates::SignalingState::HaveRemoteOffer:
+        return type == RTCSessionDescription::SdpType::Answer || type == RTCSessionDescription::SdpType::Pranswer;
+    case PeerConnectionStates::SignalingState::HaveLocalPrAnswer:
+        return type == RTCSessionDescription::SdpType::Answer || type == RTCSessionDescription::SdpType::Pranswer;
+    default:
+        return false;
+    };
+
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+void PeerConnectionBackend::setLocalDescription(RTCSessionDescription& sessionDescription, DOMPromise<void>&& promise)
+{
+    ASSERT(m_peerConnection.internalSignalingState() != PeerConnectionStates::SignalingState::Closed);
+
+    if (!isLocalDescriptionTypeValidForState(sessionDescription.type(), m_peerConnection.internalSignalingState())) {
+        promise.reject(INVALID_STATE_ERR, "Description type incompatible with current signaling state");
+        return;
+    }
+
+    m_setDescriptionPromise = WTFMove(promise);
+    doSetLocalDescription(sessionDescription);
+}
+
+void PeerConnectionBackend::setLocalDescriptionSucceeded()
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_setDescriptionPromise);
+
+    m_setDescriptionPromise->resolve();
+    m_setDescriptionPromise = std::nullopt;
+}
+
+void PeerConnectionBackend::setLocalDescriptionFailed(Exception&& exception)
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_setDescriptionPromise);
+
+    m_setDescriptionPromise->reject(WTFMove(exception));
+    m_setDescriptionPromise = std::nullopt;
+}
+
+static inline bool isRemoteDescriptionTypeValidForState(RTCSessionDescription::SdpType type, PeerConnectionStates::SignalingState state)
+{
+    switch (state) {
+    case PeerConnectionStates::SignalingState::Stable:
+        return type == RTCSessionDescription::SdpType::Offer;
+    case PeerConnectionStates::SignalingState::HaveLocalOffer:
+        return type == RTCSessionDescription::SdpType::Answer || type == RTCSessionDescription::SdpType::Pranswer;
+    case PeerConnectionStates::SignalingState::HaveRemoteOffer:
+        return type == RTCSessionDescription::SdpType::Offer;
+    case PeerConnectionStates::SignalingState::HaveRemotePrAnswer:
+        return type == RTCSessionDescription::SdpType::Answer || type == RTCSessionDescription::SdpType::Pranswer;
+    default:
+        return false;
+    };
+
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+void PeerConnectionBackend::setRemoteDescription(RTCSessionDescription& sessionDescription, DOMPromise<void>&& promise)
+{
+    ASSERT(m_peerConnection.internalSignalingState() != PeerConnectionStates::SignalingState::Closed);
+
+    if (!isRemoteDescriptionTypeValidForState(sessionDescription.type(), m_peerConnection.internalSignalingState())) {
+        promise.reject(INVALID_STATE_ERR, "Description type incompatible with current signaling state");
+        return;
+    }
+
+    m_setDescriptionPromise = WTFMove(promise);
+    doSetRemoteDescription(sessionDescription);
+}
+
+void PeerConnectionBackend::setRemoteDescriptionSucceeded()
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_setDescriptionPromise);
+
+    m_setDescriptionPromise->resolve();
+    m_setDescriptionPromise = std::nullopt;
+}
+
+void PeerConnectionBackend::setRemoteDescriptionFailed(Exception&& exception)
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_setDescriptionPromise);
+
+    m_setDescriptionPromise->reject(WTFMove(exception));
+    m_setDescriptionPromise = std::nullopt;
+}
+
+void PeerConnectionBackend::addIceCandidate(RTCIceCandidate& iceCandidate, DOMPromise<void>&& promise)
+{
+    ASSERT(m_peerConnection.internalSignalingState() != PeerConnectionStates::SignalingState::Closed);
+
+    if (iceCandidate.sdpMid().isNull() && !iceCandidate.sdpMLineIndex()) {
+        promise.reject(Exception { TypeError, ASCIILiteral("Trying to add a candidate that is missing both sdpMid and sdpMLineIndex") });
+        return;
+    }
+    m_addIceCandidatePromise = WTFMove(promise);
+    doAddIceCandidate(iceCandidate);
+}
+
+void PeerConnectionBackend::addIceCandidateSucceeded()
+{
+    ASSERT(isMainThread());
+
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    // FIXME: Update remote description and set ICE connection state to checking if not already done so.
+    ASSERT(m_addIceCandidatePromise);
+
+    m_addIceCandidatePromise->resolve();
+    m_addIceCandidatePromise = std::nullopt;
+}
+
+void PeerConnectionBackend::addIceCandidateFailed(Exception&& exception)
+{
+    ASSERT(isMainThread());
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Closed)
+        return;
+
+    ASSERT(m_addIceCandidatePromise);
+
+    m_addIceCandidatePromise->reject(WTFMove(exception));
+    m_addIceCandidatePromise = std::nullopt;
+}
+
+void PeerConnectionBackend::fireICECandidateEvent(RefPtr<RTCIceCandidate>&& candidate)
+{
+    ASSERT(isMainThread());
+
+    m_peerConnection.fireEvent(RTCIceCandidateEvent::create(false, false, WTFMove(candidate)));
+}
+
+void PeerConnectionBackend::doneGatheringCandidates()
+{
+    ASSERT(isMainThread());
+
+    m_peerConnection.fireEvent(RTCIceCandidateEvent::create(false, false, nullptr));
+    m_peerConnection.updateIceGatheringState(PeerConnectionStates::IceGatheringState::Complete);
+}
+
+void PeerConnectionBackend::updateSignalingState(PeerConnectionStates::SignalingState newSignalingState)
+{
+    ASSERT(isMainThread());
+
+    if (newSignalingState != m_peerConnection.internalSignalingState()) {
+        m_peerConnection.setSignalingState(newSignalingState);
+        m_peerConnection.fireEvent(Event::create(eventNames().signalingstatechangeEvent, false, false));
+    }
+}
+
+void PeerConnectionBackend::stop()
+{
+    m_offerAnswerPromise = std::nullopt;
+    m_setDescriptionPromise = std::nullopt;
+    m_addIceCandidatePromise = std::nullopt;
+
+    doStop();
+}
+
+void PeerConnectionBackend::markAsNeedingNegotiation()
+{
+    if (m_negotiationNeeded)
+        return;
+    
+    m_negotiationNeeded = true;
+    
+    if (m_peerConnection.internalSignalingState() == PeerConnectionStates::SignalingState::Stable)
+        m_peerConnection.scheduleNegotiationNeededEvent();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_RTC)