MSE: Add EventHandler attributes to MSE objects

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt

Index: third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
diff --git a/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt b/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
index 1aa580e1b953231545d89a0dbfc14fbb0829d7ae..1f600e64168c97e5af327a248eeff9e9e83910a6 100644
--- a/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
+++ b/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
@@ -3218,6 +3218,9 @@ interface MediaSource : EventTarget
     attribute @@toStringTag
     getter activeSourceBuffers
     getter duration
+    getter onsourceclose
+    getter onsourceended
+    getter onsourceopen
     getter readyState
     getter sourceBuffers
     method addSourceBuffer
@@ -3225,6 +3228,9 @@ interface MediaSource : EventTarget
     method endOfStream
     method removeSourceBuffer
     setter duration
+    setter onsourceclose
+    setter onsourceended
+    setter onsourceopen
 interface MediaStreamAudioDestinationNode : AudioNode
     attribute @@toStringTag
     getter stream
@@ -5129,6 +5135,11 @@ interface SourceBuffer : EventTarget
     getter appendWindowStart
     getter buffered
     getter mode
+    getter onabort
+    getter onerror
+    getter onupdate
+    getter onupdateend
+    getter onupdatestart
     getter timestampOffset
     getter updating
     method abort
@@ -5138,12 +5149,21 @@ interface SourceBuffer : EventTarget
     setter appendWindowEnd
     setter appendWindowStart
     setter mode
+    setter onabort
+    setter onerror
+    setter onupdate
+    setter onupdateend
+    setter onupdatestart
     setter timestampOffset
 interface SourceBufferList : EventTarget
     attribute @@toStringTag
     getter length
+    getter onaddsourcebuffer
+    getter onremovesourcebuffer
     method @@iterator
     method constructor
+    setter onaddsourcebuffer
+    setter onremovesourcebuffer
 interface SpeechSynthesisEvent : Event
     attribute @@toStringTag
     getter charIndex