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Minimal test - lines (16, 49)

Code

namespace mozilla {

class ProfilerChild;
class PProfilerChild;
class PProfilerParent;

// ChildProfilerController manages the setup and teardown of ProfilerChild.
// It's used on the main thread.
// It manages a background thread that ProfilerChild runs on.
class ChildProfilerController final {
 public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ChildProfilerController)

  static already_AddRefed Create(
      mozilla::ipc::Endpoint&& aEndpoint);

  [[nodiscard]] nsCString GrabShutdownProfileAndShutdown();
  void Shutdown();

 private:
  ChildProfilerController();
  ~ChildProfilerController();
  void Init(mozilla::ipc::Endpoint&& aEndpoint);
  void ShutdownAndMaybeGrabShutdownProfileFirst(nsCString* aOutShutdownProfile);

  // Called on mThread:
  void SetupProfilerChild(mozilla::ipc::Endpoint&& aEndpoint);
  void ShutdownProfilerChild(nsCString* aOutShutdownProfile);

  RefPtr mProfilerChild;  // only accessed on mThread
  RefPtr mThread;
};

}  // namespace mozilla