Renamed debug_viewer to debug_window to avoid confusion between year specific debug_viewer and debug_window.

Change-Id: I0bbd015f12abf3ffaabfd1181ff87f894a301495
diff --git a/aos/vision/blob/move_scale.h b/aos/vision/blob/move_scale.h
index e45e14d..061da5c 100644
--- a/aos/vision/blob/move_scale.h
+++ b/aos/vision/blob/move_scale.h
@@ -5,18 +5,11 @@
 #include <vector>
 
 #include "aos/vision/blob/range_image.h"
+#include "aos/vision/image/image_types.h"
 
 namespace aos {
 namespace vision {
 
-// Bounding box for a RangeImage.
-struct ImageBBox {
-  int minx = std::numeric_limits<int>::max();
-  int maxx = std::numeric_limits<int>::min();
-  int miny = std::numeric_limits<int>::max();
-  int maxy = std::numeric_limits<int>::min();
-};
-
 // Sums img into bbox. bbox is constructed empty and grows with each call
 // to GetBBox.
 void GetBBox(const RangeImage &img, ImageBBox *bbox);