tests: add output damage test

This test ensures that client submitted damage goes to the screen
correctly, regardless of output scale or transform.

The added quirk is explained in the test that uses it.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

include/libweston/libweston.h

@@ -194,6 +194,8 @@ enum weston_hdcp_protection {
  * \ingroup testharness
  */
 struct weston_testsuite_quirks {
+	/** Force GL-renderer to do a full upload of wl_shm buffers. */
+	bool gl_force_full_upload;
 };
 
 /** Weston test suite data that is given to compositor