graphics_Idle: fix arc control file.

BUG=None.
TEST=None.

Change-Id: Idc7610f13d3f5e708c9d55a65fca49c6d02caff9
Reviewed-on: https://chromium-review.googlesource.com/340931
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Tested-by: Ilja Friedel <ihf@chromium.org>
diff --git a/client/site_tests/graphics_Idle/control.arc b/client/site_tests/graphics_Idle/control.arc
index 370f4fd..d605afc 100644
--- a/client/site_tests/graphics_Idle/control.arc
+++ b/client/site_tests/graphics_Idle/control.arc
@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 
 AUTHOR = 'chromeos-gfx'
-NAME = "graphics_Idle"
+NAME = "graphics_Idle.arc"
 ATTRIBUTES = "suite:arc-bvt-cq"
 PURPOSE = "Verify that graphics behaves as expected on idle."
 CRITERIA = """