Bug 1636073 - mark 2 shared array buffer tests as backlog (tier-2). r=jgraham

mark 2 shared array buffer tests as backlog (tier-2)

Differential Revision: https://phabricator.services.mozilla.com/D76145

testing/web-platform/meta/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/blob-data.https.html.ini

@@ -1,3 +1,5 @@
+implementation-status: backlog
+bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1613912
 [blob-data.https.html]
   expected:
     if (os == "win") and debug and not webrender and (processor == "x86"): ["OK", "TIMEOUT"]

testing/web-platform/meta/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-sharedworker-failure.https.html.ini

@@ -1,3 +1,5 @@
+implementation-status: backlog
+bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1613912
 [window-sharedworker-failure.https.html]
   expected: TIMEOUT