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diff --git a/js/public/experimental/CodeCoverage.h b/js/public/experimental/CodeCoverage.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 js_experimental_CodeCoverage_h
+#define js_experimental_CodeCoverage_h
+
+#include "jstypes.h"     // JS_FRIEND_API
+#include "js/Utility.h"  // JS::UniqueChars
+
+struct JS_PUBLIC_API JSContext;
+
+namespace js {
+
+/**
+ * Enable the collection of lcov code coverage metrics.
+ * Must be called before a runtime is created and before any calls to
+ * GetCodeCoverageSummary.
+ */
+extern JS_FRIEND_API void EnableCodeCoverage();
+
+/**
+ * Generate lcov trace file content for the current realm, and allocate a new
+ * buffer and return the content in it, the size of the newly allocated content
+ * within the buffer would be set to the length out-param. The 'All' variant
+ * will collect data for all realms in the runtime.
+ *
+ * In case of out-of-memory, this function returns nullptr. The length
+ * out-param is undefined on failure.
+ */
+extern JS_FRIEND_API JS::UniqueChars GetCodeCoverageSummary(JSContext* cx,
+                                                            size_t* length);
+extern JS_FRIEND_API JS::UniqueChars GetCodeCoverageSummaryAll(JSContext* cx,
+                                                               size_t* length);
+
+}  // namespace js
+
+#endif  // js_experimental_CodeCoverage_h