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diff --git a/Source/JavaScriptCore/inspector/remote/RemoteConnectionToTarget.h b/Source/JavaScriptCore/inspector/remote/RemoteConnectionToTarget.h
new file mode 100644
index 000000000..99596e5c8
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+++ b/Source/JavaScriptCore/inspector/remote/RemoteConnectionToTarget.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2013, 2015 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorFrontendChannel.h"
+#include <wtf/Lock.h>
+#include <wtf/ThreadSafeRefCounted.h>
+
+#if PLATFORM(COCOA)
+#include <wtf/BlockPtr.h>
+#include <wtf/RetainPtr.h>
+
+OBJC_CLASS NSString;
+#endif
+
+namespace Inspector {
+
+class RemoteControllableTarget;
+
+#if PLATFORM(COCOA)
+typedef Vector<BlockPtr<void ()>> RemoteTargetQueue;
+#endif
+
+class RemoteConnectionToTarget final : public ThreadSafeRefCounted<RemoteConnectionToTarget>, public FrontendChannel {
+public:
+#if PLATFORM(COCOA)
+    RemoteConnectionToTarget(RemoteControllableTarget*, NSString* connectionIdentifier, NSString* destination);
+#endif
+    virtual ~RemoteConnectionToTarget();
+
+    // Main API.
+    bool setup(bool isAutomaticInspection = false, bool automaticallyPause = false);
+#if PLATFORM(COCOA)
+    void sendMessageToTarget(NSString *);
+#else
+    void sendMessageToTarget(const String&);
+#endif
+    void close();
+    void targetClosed();
+
+    std::optional<unsigned> targetIdentifier() const;
+#if PLATFORM(COCOA)
+    NSString *connectionIdentifier() const;
+    NSString *destination() const;
+
+    Lock& queueMutex() { return m_queueMutex; }
+    const RemoteTargetQueue& queue() const { return m_queue; }
+    void clearQueue() { m_queue.clear(); }
+#endif
+
+    // FrontendChannel overrides.
+    ConnectionType connectionType() const override { return ConnectionType::Remote; }
+    void sendMessageToFrontend(const String&) override;
+
+private:
+#if PLATFORM(COCOA)
+    void dispatchAsyncOnTarget(void (^block)());
+
+    void setupRunLoop();
+    void teardownRunLoop();
+    void queueTaskOnPrivateRunLoop(void (^block)());
+#endif
+
+    // This connection from the RemoteInspector singleton to the InspectionTarget
+    // can be used on multiple threads. So any access to the target
+    // itself must take this mutex to ensure m_target is valid.
+    Lock m_targetMutex;
+
+#if PLATFORM(COCOA)
+    // If a target has a specific run loop it wants to evaluate on
+    // we setup our run loop sources on that specific run loop.
+    RetainPtr<CFRunLoopRef> m_runLoop;
+    RetainPtr<CFRunLoopSourceRef> m_runLoopSource;
+    RemoteTargetQueue m_queue;
+    Lock m_queueMutex;
+#endif
+
+    RemoteControllableTarget* m_target { nullptr };
+    bool m_connected { false };
+
+#if PLATFORM(COCOA)
+    RetainPtr<NSString> m_connectionIdentifier;
+    RetainPtr<NSString> m_destination;
+#endif
+};
+
+} // namespace Inspector
+
+#endif // ENABLE(REMOTE_INSPECTOR)