Add new needkey event for EME.

LayoutTests/media/encrypted-media/encrypted-media-needkey-expected.txt

Index: LayoutTests/media/encrypted-media/encrypted-media-needkey-expected.txt
diff --git a/LayoutTests/media/encrypted-media/encrypted-media-needkey-expected.txt b/LayoutTests/media/encrypted-media/encrypted-media-needkey-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3779a1e673f9683d2c23455c5405925605ca190e
--- /dev/null
+++ b/LayoutTests/media/encrypted-media/encrypted-media-needkey-expected.txt
@@ -0,0 +1,47 @@
+This tests that the 'needkey' event is generated.
+
+RUN(video.src = "../content/test-encrypted.webm")
+EVENT(needkey)
+EXPECTED (event.target == '[object HTMLVideoElement]') OK
+EXPECTED (event instanceof window.MediaKeyNeededEvent == 'true') OK
+EXPECTED (event.type == 'needkey') OK
+EXPECTED (event.initData.length == '16') OK
+EXPECTED (event.initData[0] == '48') OK
+EXPECTED (event.initData[1] == '49') OK
+EXPECTED (event.initData[2] == '50') OK
+EXPECTED (event.initData[3] == '51') OK
+EXPECTED (event.initData[4] == '52') OK
+EXPECTED (event.initData[5] == '53') OK
+EXPECTED (event.initData[6] == '54') OK
+EXPECTED (event.initData[7] == '55') OK
+EXPECTED (event.initData[8] == '56') OK
+EXPECTED (event.initData[9] == '57') OK
+EXPECTED (event.initData[10] == '48') OK
+EXPECTED (event.initData[11] == '49') OK
+EXPECTED (event.initData[12] == '50') OK
+EXPECTED (event.initData[13] == '51') OK
+EXPECTED (event.initData[14] == '52') OK
+EXPECTED (event.initData[15] == '53') OK
+EVENT(needkey)
+EXPECTED (event.target == '[object HTMLVideoElement]') OK
+EXPECTED (event instanceof window.MediaKeyNeededEvent == 'true') OK
+EXPECTED (event.type == 'needkey') OK
+EXPECTED (event.initData.length == '16') OK
+EXPECTED (event.initData[0] == '48') OK
+EXPECTED (event.initData[1] == '49') OK
+EXPECTED (event.initData[2] == '50') OK
+EXPECTED (event.initData[3] == '51') OK
+EXPECTED (event.initData[4] == '52') OK
+EXPECTED (event.initData[5] == '53') OK
+EXPECTED (event.initData[6] == '54') OK
+EXPECTED (event.initData[7] == '55') OK
+EXPECTED (event.initData[8] == '56') OK
+EXPECTED (event.initData[9] == '57') OK
+EXPECTED (event.initData[10] == '48') OK
+EXPECTED (event.initData[11] == '49') OK
+EXPECTED (event.initData[12] == '50') OK
+EXPECTED (event.initData[13] == '51') OK
+EXPECTED (event.initData[14] == '52') OK
+EXPECTED (event.initData[15] == '53') OK
+END OF TEST
+