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diff --git a/tools/profiler/public/ProfileAdditionalInformation.h b/tools/profiler/public/ProfileAdditionalInformation.h
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+++ b/tools/profiler/public/ProfileAdditionalInformation.h
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+/* 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/. */
+
+// The Gecko Profiler is an always-on profiler that takes fast and low overhead
+// samples of the program execution using only userspace functionality for
+// portability. The goal of this module is to provide performance data in a
+// generic cross-platform way without requiring custom tools or kernel support.
+//
+// Samples are collected to form a timeline with optional timeline event
+// (markers) used for filtering. The samples include both native stacks and
+// platform-independent "label stack" frames.
+
+#ifndef ProfileAdditionalInformation_h
+#define ProfileAdditionalInformation_h
+
+#ifdef MOZ_GECKO_PROFILER
+#  include "shared-libraries.h"
+#endif
+#include "js/Value.h"
+#include "nsString.h"
+
+namespace IPC {
+class MessageReader;
+class MessageWriter;
+template <typename T>
+struct ParamTraits;
+}  // namespace IPC
+
+namespace mozilla {
+// This structure contains additional information gathered while generating the
+// profile json and iterating the buffer.
+struct ProfileGenerationAdditionalInformation {
+#ifdef MOZ_GECKO_PROFILER
+  ProfileGenerationAdditionalInformation() = default;
+  explicit ProfileGenerationAdditionalInformation(
+      const SharedLibraryInfo&& aSharedLibraries)
+      : mSharedLibraries(aSharedLibraries) {}
+
+  size_t SizeOf() const { return mSharedLibraries.SizeOf(); }
+
+  void Append(ProfileGenerationAdditionalInformation&& aOther) {
+    mSharedLibraries.AddAllSharedLibraries(aOther.mSharedLibraries);
+  }
+
+  void FinishGathering() { mSharedLibraries.DeduplicateEntries(); }
+
+  void ToJSValue(JSContext* aCx, JS::MutableHandle<JS::Value> aRetVal) const;
+
+  SharedLibraryInfo mSharedLibraries;
+#endif  // MOZ_GECKO_PROFILER
+};
+
+struct ProfileAndAdditionalInformation {
+  ProfileAndAdditionalInformation() = default;
+  explicit ProfileAndAdditionalInformation(const nsCString&& aProfile)
+      : mProfile(aProfile) {}
+
+  ProfileAndAdditionalInformation(
+      const nsCString&& aProfile,
+      const ProfileGenerationAdditionalInformation&& aAdditionalInformation)
+      : mProfile(aProfile),
+        mAdditionalInformation(Some(aAdditionalInformation)) {}
+
+  size_t SizeOf() const {
+    size_t size = mProfile.Length();
+#ifdef MOZ_GECKO_PROFILER
+    if (mAdditionalInformation.isSome()) {
+      size += mAdditionalInformation->SizeOf();
+    }
+#endif
+    return size;
+  }
+
+  nsCString mProfile;
+  Maybe<ProfileGenerationAdditionalInformation> mAdditionalInformation;
+};
+}  // namespace mozilla
+
+namespace IPC {
+template <>
+struct ParamTraits<mozilla::ProfileGenerationAdditionalInformation> {
+  typedef mozilla::ProfileGenerationAdditionalInformation paramType;
+
+  static void Write(MessageWriter* aWriter, const paramType& aParam);
+  static bool Read(MessageReader* aReader, paramType* aResult);
+};
+}  // namespace IPC
+
+#endif  // ProfileAdditionalInformation_h