Converts test_wm to use aura

ui/wm/core/wm_state.h

Index: ui/wm/core/wm_state.h
diff --git a/ui/wm/core/wm_state.h b/ui/wm/core/wm_state.h
index 660a1c8450805d8705a161cb2127db365c045bbc..5337ec4df6675f4bb2c40e564f67a78ac8059a03 100644
--- a/ui/wm/core/wm_state.h
+++ b/ui/wm/core/wm_state.h
@@ -22,6 +22,8 @@ class WM_EXPORT WMState {
   WMState();
   ~WMState();
 
+  CaptureController* capture_controller() { return capture_controller_.get(); }
+
  private:
   std::unique_ptr<TransientWindowStackingClient> window_stacking_client_;
   std::unique_ptr<TransientWindowController> transient_window_client_;