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diff --git a/netwerk/ipc/PSocketProcessBridge.ipdl b/netwerk/ipc/PSocketProcessBridge.ipdl
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+++ b/netwerk/ipc/PSocketProcessBridge.ipdl
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+include protocol PBackgroundDataBridge;
+
+#ifdef MOZ_WEBRTC
+include protocol PMediaTransport;
+#endif // MOZ_WEBRTC
+
+
+namespace mozilla {
+namespace net {
+
+/**
+  * PSocketProcessBridge is the IPC protocol between the main thread in
+  * the content process and the main thread in the socket process.
+  * We use this to create PBackgroundDataBridge and PMediaTransport protocols
+  * between content process and socket process.
+  * Once created, PSocketProcessBridgeChild is the actor that lives in
+  * content process and PSocketProcessBridgeParent lives in
+  * socket process.
+  */
+[NeedsOtherPid, ParentProc=Socket, ChildProc=Content]
+sync protocol PSocketProcessBridge
+{
+parent:
+  /**
+    * For setting up PBackgroundDataBridge protocol, we use this message to
+    * create a background task queue and the BackgroundDataBridgeParent actor in
+    * socket process.
+    */
+  async InitBackgroundDataBridge(Endpoint<PBackgroundDataBridgeParent> aEndpoint,
+                                 uint64_t aChannelID);
+
+#ifdef MOZ_WEBRTC
+  /**
+    * Similar to the above, this message is for PMediaTransport.
+    */
+  async InitMediaTransport(Endpoint<PMediaTransportParent> aEndpoint);
+#endif // MOZ_WEBRTC
+
+};
+
+}
+}