Add window cycle completion and cancellation accelerators in mus+ash.

ash/mus/accelerators/accelerator_controller_registrar.h

Index: ash/mus/accelerators/accelerator_controller_registrar.h
diff --git a/ash/mus/accelerators/accelerator_controller_registrar.h b/ash/mus/accelerators/accelerator_controller_registrar.h
index 737c607855c6564b6bda6b7b425e01d14c99a078..4c458abf029b7c176334e8d19a4c460e12cd2474 100644
--- a/ash/mus/accelerators/accelerator_controller_registrar.h
+++ b/ash/mus/accelerators/accelerator_controller_registrar.h
@@ -57,6 +57,12 @@ class AcceleratorControllerRegistrar : public AcceleratorHandler,
       const ui::Accelerator& accelerator,
       std::vector<ui::mojom::WmAcceleratorPtr>& accelerator_vector);
 
+  // TODO(moshayedi): crbug.com/629191. Handling window cycle accelerators here
+  // is just a temporary solution and we should remove these once we have a
+  // proper solution.
+  void RegisterWindowCycleAccelerators();
+  bool HandleWindowCycleAccelerator(const ui::Accelerator& accelerator);
+
   // The flow of accelerators in ash is:
   // . wm::AcceleratorFilter() sees events first as it's a pre-target handler.
   // . AcceleratorFilter forwards to its delegate, which indirectly is