Web MIDI: prepare to deprecate MIDIMessageEvent::receivedTime

third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.idl

Index: third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.idl
diff --git a/third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.idl b/third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.idl
index bf252c0563dd5c927bf3d8a363bb51796aee6cda..7fbd0f6ba277ef15dd0599cead16daac4cf00d15 100644
--- a/third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.idl
+++ b/third_party/WebKit/Source/modules/webmidi/MIDIMessageEvent.idl
@@ -30,9 +30,12 @@
 
 // http://webaudio.github.io/web-midi-api/#idl-def-MIDIMessageEvent
 
+// TODO(toyoshim): Remove ConstructorCallWith=ExecutionContext and receivedTime.
+// See https://github.com/WebAudio/web-midi-api/issues/145 and crbug.com/599335.
 [
     Constructor(DOMString type, optional MIDIMessageEventInit eventInitDict),
+    ConstructorCallWith=ExecutionContext,
 ] interface MIDIMessageEvent : Event {
-    readonly attribute double receivedTime;
+    [DeprecateAs=MIDIMessageEventReceivedTime] readonly attribute double receivedTime;
     readonly attribute Uint8Array data;
 };