diff --git a/src/debug/debug-coverage.h b/src/debug/debug-coverage.h
new file mode 100644
index 0000000..36128bc
--- /dev/null
+++ b/src/debug/debug-coverage.h
@@ -0,0 +1,53 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_DEBUG_DEBUG_COVERAGE_H_
+#define V8_DEBUG_DEBUG_COVERAGE_H_
+
+#include <vector>
+
+#include "src/debug/debug-interface.h"
+#include "src/objects.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward declaration.
+class Isolate;
+
+struct CoverageFunction {
+  CoverageFunction(int s, int e, uint32_t c, Handle<String> n)
+      : start(s), end(e), count(c), name(n) {}
+  int start;
+  int end;
+  uint32_t count;
+  Handle<String> name;
+};
+
+struct CoverageScript {
+  // Initialize top-level function in case it has been garbage-collected.
+  CoverageScript(Isolate* isolate, Handle<Script> s) : script(s) {}
+  Handle<Script> script;
+  // Functions are sorted by start position, from outer to inner function.
+  std::vector<CoverageFunction> functions;
+};
+
+class Coverage : public std::vector<CoverageScript> {
+ public:
+  // Allocate a new Coverage object and populate with result.
+  // The ownership is transferred to the caller.
+  static Coverage* Collect(Isolate* isolate, bool reset_count);
+
+  // Enable precise code coverage. This disables optimization and makes sure
+  // invocation count is not affected by GC.
+  static void TogglePrecise(Isolate* isolate, bool enable);
+
+ private:
+  Coverage() {}
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_DEBUG_DEBUG_COVERAGE_H_