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diff --git a/js/public/friend/UsageStatistics.h b/js/public/friend/UsageStatistics.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/. */
+
+/* Telemetry and use counter functionality. */
+
+#ifndef js_friend_UsageStatistics_h
+#define js_friend_UsageStatistics_h
+
+#include <stdint.h> // uint32_t
+
+#include "jstypes.h" // JS_PUBLIC_API
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSObject;
+
+/*
+ * Telemetry reasons passed to the accumulate telemetry callback.
+ *
+ * It's OK for these enum values to change as they will be mapped to a fixed
+ * member of the mozilla::Telemetry::HistogramID enum by the callback.
+ */
+#define FOR_EACH_JS_METRIC(_) \
+ _(GC_REASON_2, Enumeration) \
+ _(GC_IS_COMPARTMENTAL, Boolean) \
+ _(GC_ZONE_COUNT, QuantityDistribution) \
+ _(GC_ZONES_COLLECTED, QuantityDistribution) \
+ _(GC_MS, TimeDuration_MS) \
+ _(GC_BUDGET_MS_2, TimeDuration_MS) \
+ _(GC_BUDGET_WAS_INCREASED, Boolean) \
+ _(GC_SLICE_WAS_LONG, Boolean) \
+ _(GC_BUDGET_OVERRUN, TimeDuration_US) \
+ _(GC_ANIMATION_MS, TimeDuration_MS) \
+ _(GC_MAX_PAUSE_MS_2, TimeDuration_MS) \
+ _(GC_PREPARE_MS, TimeDuration_MS) \
+ _(GC_MARK_MS, TimeDuration_MS) \
+ _(GC_SWEEP_MS, TimeDuration_MS) \
+ _(GC_COMPACT_MS, TimeDuration_MS) \
+ _(GC_MARK_ROOTS_US, TimeDuration_US) \
+ _(GC_MARK_GRAY_MS_2, TimeDuration_MS) \
+ _(GC_MARK_WEAK_MS, TimeDuration_MS) \
+ _(GC_SLICE_MS, TimeDuration_MS) \
+ _(GC_SLOW_PHASE, Enumeration) \
+ _(GC_SLOW_TASK, Enumeration) \
+ _(GC_MMU_50, Percentage) \
+ _(GC_RESET, Boolean) \
+ _(GC_RESET_REASON, Enumeration) \
+ _(GC_NON_INCREMENTAL, Boolean) \
+ _(GC_NON_INCREMENTAL_REASON, Enumeration) \
+ _(GC_MINOR_REASON, Enumeration) \
+ _(GC_MINOR_REASON_LONG, Enumeration) \
+ _(GC_MINOR_US, TimeDuration_US) \
+ _(GC_NURSERY_BYTES_2, MemoryDistribution) \
+ _(GC_PRETENURE_COUNT_2, QuantityDistribution) \
+ _(GC_NURSERY_PROMOTION_RATE, Percentage) \
+ _(GC_TENURED_SURVIVAL_RATE, Percentage) \
+ _(GC_MARK_RATE_2, QuantityDistribution) \
+ _(GC_TIME_BETWEEN_S, TimeDuration_S) \
+ _(GC_TIME_BETWEEN_SLICES_MS, TimeDuration_MS) \
+ _(GC_SLICE_COUNT, QuantityDistribution) \
+ _(DESERIALIZE_BYTES, MemoryDistribution) \
+ _(DESERIALIZE_ITEMS, QuantityDistribution) \
+ _(DESERIALIZE_US, TimeDuration_US) \
+ _(GC_EFFECTIVENESS, MemoryDistribution) \
+ _(GC_PARALLEL_MARK, Boolean) \
+ _(GC_PARALLEL_MARK_SPEEDUP, Integer) \
+ _(GC_PARALLEL_MARK_UTILIZATION, Percentage) \
+ _(GC_PARALLEL_MARK_INTERRUPTIONS, Integer) \
+ _(GC_TASK_START_DELAY_US, TimeDuration_US)
+
+// clang-format off
+#define ENUM_DEF(NAME, _) NAME,
+enum class JSMetric {
+ FOR_EACH_JS_METRIC(ENUM_DEF)
+ Count
+};
+#undef ENUM_DEF
+// clang-format on
+
+using JSAccumulateTelemetryDataCallback = void (*)(JSMetric, uint32_t);
+
+extern JS_PUBLIC_API void JS_SetAccumulateTelemetryCallback(
+ JSContext* cx, JSAccumulateTelemetryDataCallback callback);
+
+/*
+ * Use counter names passed to the accumulate use counter callback.
+ *
+ * It's OK to for these enum values to change as they will be mapped to a
+ * fixed member of the mozilla::UseCounter enum by the callback.
+ */
+
+enum class JSUseCounter { ASMJS, WASM, WASM_LEGACY_EXCEPTIONS, LATE_WEEKDAY };
+
+using JSSetUseCounterCallback = void (*)(JSObject*, JSUseCounter);
+
+extern JS_PUBLIC_API void JS_SetSetUseCounterCallback(
+ JSContext* cx, JSSetUseCounterCallback callback);
+
+#endif // js_friend_UsageStatistics_h