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diff --git a/tools/profiler/gecko/PProfiler.ipdl b/tools/profiler/gecko/PProfiler.ipdl
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+++ b/tools/profiler/gecko/PProfiler.ipdl
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=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 ProfilerTypes;
+
+namespace mozilla {
+
+// PProfiler is a top-level protocol. It is used to let the main process
+// control the Gecko Profiler in other processes, and request profiles from
+// those processes.
+// It is a top-level protocol so that its child endpoint can be on a
+// background thread, so that profiles can be gathered even if the main thread
+// is unresponsive.
+[ChildImpl=virtual, ParentImpl=virtual, ChildProc=anychild]
+async protocol PProfiler
+{
+child:
+  // The unused returned value is to have a promise we can await.
+  async Start(ProfilerInitParams params) returns (bool unused);
+  async EnsureStarted(ProfilerInitParams params) returns (bool unused);
+  async Stop() returns (bool unused);
+  async Pause() returns (bool unused);
+  async Resume() returns (bool unused);
+  async PauseSampling() returns (bool unused);
+  async ResumeSampling() returns (bool unused);
+
+  async WaitOnePeriodicSampling() returns (bool sampled);
+
+  async AwaitNextChunkManagerUpdate() returns (ProfileBufferChunkManagerUpdate update);
+  async DestroyReleasedChunksAtOrBefore(TimeStamp timeStamp);
+
+  // The returned shmem may contain an empty string (unavailable), an error
+  // message starting with '*', or a profile as a stringified JSON object.
+  async GatherProfile() returns (IPCProfileAndAdditionalInformation profileAndAdditionalInformation);
+  async GetGatherProfileProgress() returns (GatherProfileProgress progress);
+
+  async ClearAllPages();
+};
+
+} // namespace mozilla
+