Bug 1650049 [wpt PR 24422] - Update wpt metadata, a=testonly

wpt-pr: 24422 wpt-type: metadata
2020-07-10 00:30:03 +00:00 · 2020-07-10 00:30:03 +00:00 · 81fd729317
--- a/testing/web-platform/meta/fetch/origin/dir.ini
+++ b/testing/web-platform/meta/fetch/origin/dir.ini
@ -0,0 +1 @@
+leak-threshold: [gpu:51200]