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diff --git a/dom/media/ipc/PRDD.ipdl b/dom/media/ipc/PRDD.ipdl
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+++ b/dom/media/ipc/PRDD.ipdl
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 GraphicsMessages;
+include MemoryReportTypes;
+include PrefsTypes;
+
+include protocol PProfiler;
+include protocol PRemoteDecoderManager;
+include protocol PVideoBridge;
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+include protocol PSandboxTesting;
+#endif
+
+include "mozilla/ipc/ByteBufUtils.h";
+
+using mozilla::dom::ContentParentId from "mozilla/dom/ipc/IdType.h";
+using mozilla::dom::NativeThreadId from "mozilla/dom/NativeThreadId.h";
+using mozilla::media::MediaCodecsSupported from "MediaCodecsSupport.h";
+
+// Telemetry
+using mozilla::Telemetry::HistogramAccumulation from "mozilla/TelemetryComms.h";
+using mozilla::Telemetry::KeyedHistogramAccumulation from "mozilla/TelemetryComms.h";
+using mozilla::Telemetry::ScalarAction from "mozilla/TelemetryComms.h";
+using mozilla::Telemetry::KeyedScalarAction from "mozilla/TelemetryComms.h";
+using mozilla::Telemetry::ChildEventData from "mozilla/TelemetryComms.h";
+using mozilla::Telemetry::DiscardedData from "mozilla/TelemetryComms.h";
+
+#if defined(XP_WIN)
+[MoveOnly] using mozilla::UntrustedModulesData from "mozilla/UntrustedModulesData.h";
+[MoveOnly] using mozilla::ModulePaths from "mozilla/UntrustedModulesData.h";
+[MoveOnly] using mozilla::ModulesMapResult from "mozilla/UntrustedModulesData.h";
+#endif  // defined(XP_WIN)
+
+namespace mozilla {
+
+// This protocol allows the UI process to talk to the RDD
+// (RemoteDataDecoder) process. There is one instance of this protocol,
+// with the RDDParent living on the main thread of the RDD process and
+// the RDDChild living on the main thread of the UI process.
+[NeedsOtherPid, ParentProc=RDD, ChildProc=Parent]
+protocol PRDD
+{
+parent:
+
+  async Init(GfxVarUpdate[] vars, FileDescriptor? sandboxBroker,
+             bool canRecordReleaseTelemetry,
+             bool aIsReadyForBackgroundProcessing);
+
+  async InitProfiler(Endpoint<PProfilerChild> endpoint);
+
+  async NewContentRemoteDecoderManager(
+            Endpoint<PRemoteDecoderManagerParent> endpoint, ContentParentId childId);
+
+  async RequestMemoryReport(uint32_t generation,
+                            bool anonymize,
+                            bool minimizeMemoryUsage,
+                            FileDescriptor? DMDFile)
+      returns (uint32_t aGeneration);
+
+  async PreferenceUpdate(Pref pref);
+
+  async UpdateVar(GfxVarUpdate var);
+
+  async InitVideoBridge(Endpoint<PVideoBridgeChild> endpoint,
+                        bool createHardwareDevice,
+                        ContentDeviceData contentDeviceData);
+
+#if defined(XP_WIN)
+  async GetUntrustedModulesData() returns (UntrustedModulesData? data);
+
+  /**
+  * This method is used to notifty a child process to start
+  * processing module loading events in UntrustedModulesProcessor.
+  * This should be called when the parent process has gone idle.
+  */
+  async UnblockUntrustedModulesThread();
+#endif  // defined(XP_WIN)
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+  async InitSandboxTesting(Endpoint<PSandboxTestingChild> aEndpoint);
+#endif
+
+  // Tells the RDD process to flush any pending telemetry.
+  // Used in tests and ping assembly. Buffer contains bincoded Rust structs.
+  // https://firefox-source-docs.mozilla.org/toolkit/components/glean/dev/ipc.html
+  async FlushFOGData() returns (ByteBuf buf);
+
+  // Test-only method.
+  // Asks the RDD process to trigger test-only instrumentation.
+  // The unused returned value is to have a promise we can await.
+  async TestTriggerMetrics() returns (bool unused);
+
+  async TestTelemetryProbes();
+
+child:
+
+  async InitCrashReporter(NativeThreadId threadId);
+
+  async AddMemoryReport(MemoryReport aReport);
+
+#if defined(XP_WIN)
+  async GetModulesTrust(ModulePaths aModPaths, bool aRunAtNormalPriority)
+      returns (ModulesMapResult? modMapResult);
+#endif  // defined(XP_WIN)
+
+  // Update the cached list of codec supported following a check in the
+  // RDD parent.
+  async UpdateMediaCodecsSupported(MediaCodecsSupported aSupported);
+
+  // Messages for sending telemetry to parent process.
+  async AccumulateChildHistograms(HistogramAccumulation[] accumulations);
+  async AccumulateChildKeyedHistograms(KeyedHistogramAccumulation[] accumulations);
+  async UpdateChildScalars(ScalarAction[] actions);
+  async UpdateChildKeyedScalars(KeyedScalarAction[] actions);
+  async RecordChildEvents(ChildEventData[] events);
+  async RecordDiscardedData(DiscardedData data);
+
+  // Sent from time-to-time to limit the amount of telemetry vulnerable to loss
+  // Buffer contains bincoded Rust structs.
+  // https://firefox-source-docs.mozilla.org/toolkit/components/glean/dev/ipc.html
+  async FOGData(ByteBuf buf);
+};
+
+} // namespace mozilla