Implement the MediaStreamTrackEvent constructor

third_party/WebKit/Source/modules/mediastream/MediaStreamTrackEventInit.idl

Index: third_party/WebKit/Source/modules/mediastream/MediaStreamTrackEventInit.idl
diff --git a/ash/public/interfaces/ash_window_type.mojom b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackEventInit.idl
similarity index 52%
copy from ash/public/interfaces/ash_window_type.mojom
copy to third_party/WebKit/Source/modules/mediastream/MediaStreamTrackEventInit.idl
index 61f2c4d6435fb90668777035bb9cdeeb3fa4c3b7..4be97fa2df46613fb667b85e00def3e9d66a5f7c 100644
--- a/ash/public/interfaces/ash_window_type.mojom
+++ b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackEventInit.idl
@@ -2,12 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module ash.mojom;
+// https://w3c.github.io/mediacapture-main/#mediastreamtrackevent
 
-enum AshWindowType {
-  SHELF = 0,
-  STATUS_AREA,
-  COUNT
+dictionary MediaStreamTrackEventInit : EventInit {
+    required MediaStreamTrack track;
 };
-
-const string kAshWindowType_Property = "ash:window-type";