Add constructors for WebAudio nodes

third_party/WebKit/Source/modules/webaudio/ChannelMergerOptions.idl

Index: third_party/WebKit/Source/modules/webaudio/ChannelMergerOptions.idl
diff --git a/ash/public/interfaces/ash_window_type.mojom b/third_party/WebKit/Source/modules/webaudio/ChannelMergerOptions.idl
similarity index 50%
copy from ash/public/interfaces/ash_window_type.mojom
copy to third_party/WebKit/Source/modules/webaudio/ChannelMergerOptions.idl
index 61f2c4d6435fb90668777035bb9cdeeb3fa4c3b7..1e9e7d24f8263240bd0744a5fcafaebde9b54e9f 100644
--- a/ash/public/interfaces/ash_window_type.mojom
+++ b/third_party/WebKit/Source/modules/webaudio/ChannelMergerOptions.idl
@@ -2,12 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module ash.mojom;
-
-enum AshWindowType {
-  SHELF = 0,
-  STATUS_AREA,
-  COUNT
-};
-
-const string kAshWindowType_Property = "ash:window-type";
+// See https://webaudio.github.io/web-audio-api/#channelmergeroptions
+dictionary ChannelMergerOptions : AudioNodeOptions {
+    unsigned long numberOfInputs = 6;
+};