Rotate image for new camera mount.

Change-Id: Ie2d5e76d8a8db0882778bccf0d53c6f670b8e5c5
diff --git a/y2019/image_streamer/flip_image.cc b/y2019/image_streamer/flip_image.cc
index 2db20b2..48a18c5 100644
--- a/y2019/image_streamer/flip_image.cc
+++ b/y2019/image_streamer/flip_image.cc
@@ -10,7 +10,9 @@
   ::cimg_library::CImg<unsigned char> image;
   image.load_jpeg_buffer((JOCTET *)(input), input_size);
   if (flip) {
-    image.mirror("xy");
+    image.rotate(90);
+  } else {
+    image.rotate(270);
   }
 
   image.save_jpeg_buffer(buffer, *buffer_size, 80);