Add some bug annotations to a few of the web platform tests ini files. No bug, rs=jgraham

testing/web-platform/meta/workers/MessagePort_initial_disabled.htm.ini

@@ -2,4 +2,5 @@
   type: testharness
   [ MessageChannel: port message queue is initially disabled ]
     expected: FAIL
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=952139
 

testing/web-platform/meta/workers/MessagePort_onmessage_start.htm.ini

@@ -2,4 +2,5 @@
   type: testharness
   [ MessageChannel: port.onmessage enables message queue ]
     expected: FAIL
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=952139
 

testing/web-platform/meta/workers/interfaces.worker.js.ini

@@ -2,6 +2,7 @@
   type: testharness
   [WorkerGlobalScope interface: attribute onlanguagechange]
     expected: FAIL
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1154779
 
   [WorkerGlobalScope interface: operation importScripts(DOMString)]
     expected: FAIL
@@ -29,6 +30,7 @@
 
   [WorkerGlobalScope interface: self must inherit property "onlanguagechange" with the proper type (4)]
     expected: FAIL
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1154779
 
   [WorkerGlobalScope interface: calling importScripts(DOMString) on self with too few arguments must throw TypeError]
     expected: FAIL

testing/web-platform/meta/workers/postMessage_event_properties.htm.ini

@@ -2,4 +2,5 @@
   type: testharness
   [ postMessage(): MessageEvent properties ]
     expected: FAIL
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=952139