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Minimal test - lines (13, 64)

Code

namespace mozilla {

namespace layers {
class SynchronousTask;
}

namespace widget {

struct WinCompositorWnds {
  HWND mCompositorWnd;
  HWND mInitialParentWnd;
  WinCompositorWnds(HWND aCompositorWnd, HWND aInitialParentWnd)
      : mCompositorWnd(aCompositorWnd), mInitialParentWnd(aInitialParentWnd) {}
};

class WinCompositorWindowThread final {
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DELETE_ON_MAIN_THREAD(
      WinCompositorWindowThread)

 public:
  /// Can be called from any thread.
  static WinCompositorWindowThread* Get();

  /// Can only be called from the main thread.
  static void Start();

  /// Can only be called from the main thread.
  static void ShutDown();

  /// Can be called from any thread.
  static MessageLoop* Loop();

  /// Can be called from any thread.
  static bool IsInCompositorWindowThread();

  /// Can be called from any thread.
  static WinCompositorWnds CreateCompositorWindow();

  /// Can be called from any thread.
  static void DestroyCompositorWindow(WinCompositorWnds aWnds);

 private:
  explicit WinCompositorWindowThread(base::Thread* aThread);
  ~WinCompositorWindowThread();

  void ShutDownTask(layers::SynchronousTask* aTask);

  base::Thread* const mThread;
};

}  // namespace widget
}  // namespace mozilla