Add camera primer. This starts up the camera properly.

Change-Id: I8ad07919b27e2fea436026b9f9fdd86b54a4286a
diff --git a/aos/vision/tools/BUILD b/aos/vision/tools/BUILD
index 56bbb5b..ac6a6ff 100644
--- a/aos/vision/tools/BUILD
+++ b/aos/vision/tools/BUILD
@@ -17,3 +17,14 @@
     "//aos/vision/events:gtk_event",
   ],
 )
+
+cc_binary(
+  name = 'camera_primer',
+  srcs = ['camera_primer.cc'],
+  deps = [
+    '//aos/common/logging:logging',
+    '//aos/common/logging:implementations',
+    '//aos/vision/image:image_stream',
+    '//aos/vision/events:epoll_events',
+  ],
+)