Updating metadata after Chrome rolls.

tools/dom/scripts/htmleventgenerator.py

Index: tools/dom/scripts/htmleventgenerator.py
diff --git a/tools/dom/scripts/htmleventgenerator.py b/tools/dom/scripts/htmleventgenerator.py
index c2ead7ced553d5b73ffedd453dd2c4ca9b692cb7..cd3ad6acb3b13fc5b01e2c09773bcde435f34d02 100644
--- a/tools/dom/scripts/htmleventgenerator.py
+++ b/tools/dom/scripts/htmleventgenerator.py
@@ -155,10 +155,16 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   'IDBOpenDBRequest.upgradeneeded': ('upgradeNeeded', 'VersionChangeEvent'),
   'IDBRequest.success': ('success', 'Event'),
   'IDBTransaction.complete': ('complete', 'Event'),
+  'MediaKeySession.webkitkeyadded': ('keyAdded', 'MediaKeyEvent'),
+  'MediaKeySession.webkitkeyerror': ('keyError', 'MediaKeyEvent'),
+  'MediaKeySession.webkitkeymessage': ('keyMessage', 'MediaKeyEvent'),
   'MediaStream.addtrack': ('addTrack', 'Event'),
   'MediaStream.removetrack': ('removeTrack', 'Event'),
   'MediaStreamTrack.mute': ('mute', 'Event'),
   'MediaStreamTrack.unmute': ('unmute', 'Event'),
+  'MIDIAccess.connect': ('connect', 'MidiConnectionEvent'),
+  'MIDIAccess.disconnect': ('connect', 'MidiConnectionEvent'),
+  'MIDIInput.midimessage': ('midiMessage', 'MidiMessageEvent'),
   'MIDIPort.disconnect': ('disconnect', 'MidiConnectionEvent'),
   'Notification.click': ('click', 'Event'),
   'Notification.close': ('close', 'Event'),