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diff --git a/tools/profiler/public/ProfilerParent.h b/tools/profiler/public/ProfilerParent.h
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+++ b/tools/profiler/public/ProfilerParent.h
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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/. */
+
+#ifndef ProfilerParent_h
+#define ProfilerParent_h
+
+#include "mozilla/PProfilerParent.h"
+#include "mozilla/RefPtr.h"
+
+class nsIProfilerStartParams;
+
+namespace mozilla {
+
+class ProfileBufferGlobalController;
+class ProfilerParentTracker;
+
+// This is the main process side of the PProfiler protocol.
+// ProfilerParent instances only exist on the main thread of the main process.
+// The other side (ProfilerChild) lives on a background thread in the other
+// process.
+// The creation of PProfiler actors is initiated from the main process, after
+// the other process has been launched.
+// ProfilerParent instances are destroyed once the message channel closes,
+// which can be triggered by either process, depending on which one shuts down
+// first.
+// All ProfilerParent instances are registered with a manager class called
+// ProfilerParentTracker, which has the list of living ProfilerParent instances
+// and handles shutdown.
+class ProfilerParent final : public PProfilerParent {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ProfilerParent, final)
+
+  static mozilla::ipc::Endpoint<PProfilerChild> CreateForProcess(
+      base::ProcessId aOtherPid);
+
+#ifdef MOZ_GECKO_PROFILER
+  using SingleProcessProfilePromise =
+      MozPromise<IPCProfileAndAdditionalInformation, ResponseRejectReason,
+                 true>;
+
+  struct SingleProcessProfilePromiseAndChildPid {
+    RefPtr<SingleProcessProfilePromise> profilePromise;
+    base::ProcessId childPid;
+  };
+
+  using SingleProcessProgressPromise =
+      MozPromise<GatherProfileProgress, ResponseRejectReason, true>;
+
+  // The following static methods can be called on any thread, but they are
+  // no-ops on anything other than the main thread.
+  // If called on the main thread, the call will be broadcast to all
+  // registered processes (all processes for which we have a ProfilerParent
+  // object).
+  // At the moment, the main process always calls these methods on the main
+  // thread, and that's the only process in which we need to forward these
+  // calls to other processes. The other processes will call these methods on
+  // the ProfilerChild background thread, but those processes don't need to
+  // forward these calls any further.
+
+  // Returns the profiles to expect, as promises and child pids.
+  static nsTArray<SingleProcessProfilePromiseAndChildPid> GatherProfiles();
+
+  // Send a request to get the GatherProfiles() progress update from one child
+  // process, returns a promise to be resolved with that progress.
+  // The promise RefPtr may be null if the child process is unknown.
+  // Progress may be invalid, if the request arrived after the child process
+  // had already responded to the main GatherProfile() IPC, or something went
+  // very wrong in that process.
+  static RefPtr<SingleProcessProgressPromise> RequestGatherProfileProgress(
+      base::ProcessId aChildPid);
+
+  // This will start the profiler in all child processes. The returned promise
+  // will be resolved when all child have completed their operation
+  // (successfully or not.)
+  [[nodiscard]] static RefPtr<GenericPromise> ProfilerStarted(
+      nsIProfilerStartParams* aParams);
+  static void ProfilerWillStopIfStarted();
+  [[nodiscard]] static RefPtr<GenericPromise> ProfilerStopped();
+  [[nodiscard]] static RefPtr<GenericPromise> ProfilerPaused();
+  [[nodiscard]] static RefPtr<GenericPromise> ProfilerResumed();
+  [[nodiscard]] static RefPtr<GenericPromise> ProfilerPausedSampling();
+  [[nodiscard]] static RefPtr<GenericPromise> ProfilerResumedSampling();
+  static void ClearAllPages();
+
+  [[nodiscard]] static RefPtr<GenericPromise> WaitOnePeriodicSampling();
+
+  // Create a "Final" update that the Child can return to its Parent.
+  static ProfileBufferChunkManagerUpdate MakeFinalUpdate();
+
+  // True if the ProfilerParent holds a lock on this thread.
+  static bool IsLockedOnCurrentThread();
+
+ private:
+  friend class ProfileBufferGlobalController;
+  friend class ProfilerParentTracker;
+
+  explicit ProfilerParent(base::ProcessId aChildPid);
+
+  void Init();
+  void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
+
+  void RequestChunkManagerUpdate();
+
+  base::ProcessId mChildPid;
+  nsTArray<MozPromiseHolder<SingleProcessProfilePromise>>
+      mPendingRequestedProfiles;
+  bool mDestroyed;
+#endif  // MOZ_GECKO_PROFILER
+
+ private:
+  virtual ~ProfilerParent();
+};
+
+}  // namespace mozilla
+
+#endif  // ProfilerParent_h