Add additional layout tests for MediaKeySession.keyStatuses

LayoutTests/media/encrypted-media/encrypted-media-keystatuses-multiple-sessions-expected.txt

Index: LayoutTests/media/encrypted-media/encrypted-media-keystatuses-multiple-sessions-expected.txt
diff --git a/LayoutTests/media/encrypted-media/encrypted-media-keystatuses-expected.txt b/LayoutTests/media/encrypted-media/encrypted-media-keystatuses-multiple-sessions-expected.txt
similarity index 51%
copy from LayoutTests/media/encrypted-media/encrypted-media-keystatuses-expected.txt
copy to LayoutTests/media/encrypted-media/encrypted-media-keystatuses-multiple-sessions-expected.txt
index ed31d8555699b9255af1f65dd388366ceb0ec590..400e50df72be05a17dbb11554ad7785dc30b1ed2 100644
--- a/LayoutTests/media/encrypted-media/encrypted-media-keystatuses-expected.txt
+++ b/LayoutTests/media/encrypted-media/encrypted-media-keystatuses-multiple-sessions-expected.txt
@@ -2,17 +2,27 @@ EVENT(message)
 EVENT(keystatuseschange)
 for (var entry of keyStatuses)
 123, usable
-4567890, usable
 for (var key of keyStatuses.keys())
 123
-4567890
 for (var value of keyStatuses.values())
 usable
-usable
 for (var entry of keyStatuses.entries())
 123, usable
+keyStatuses.forEach()
+123, usable
+EVENT(message)
+EVENT(keystatuseschange)
+for (var entry of keyStatuses)
+4567890, usable
+for (var key of keyStatuses.keys())
+4567890
+for (var value of keyStatuses.values())
+usable
+for (var entry of keyStatuses.entries())
+4567890, usable
+keyStatuses.forEach()
 4567890, usable
 This is a testharness.js-based test.
-PASS Verify MediaKeySession.keyStatuses. 
+PASS Verify MediaKeySession.keyStatuses with multiple sessions. 
 Harness: the test ran to completion.