Migrate MediaDevices.enumerateDevices to Mojo

content/common/media/media_devices_param_traits.h

Index: content/common/media/media_devices_param_traits.h
diff --git a/content/common/media/media_devices_param_traits.h b/content/common/media/media_devices_param_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed0830c108f8f092abfac4fd78cabdfcec8de590
--- /dev/null
+++ b/content/common/media/media_devices_param_traits.h
@@ -0,0 +1,21 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Multiply-included IPC traits file, hence no include guard.
+
+#include "content/common/content_export.h"
+#include "content/common/media/media_devices.h"
+#include "ipc/ipc_message_macros.h"
+
+#undef IPC_MESSAGE_EXPORT
+#define IPC_MESSAGE_EXPORT CONTENT_EXPORT
+
+IPC_ENUM_TRAITS_MAX_VALUE(content::MediaDeviceType,
+                          content::NUM_MEDIA_DEVICE_TYPES - 1)
+
+IPC_STRUCT_TRAITS_BEGIN(content::MediaDeviceInfo)
+  IPC_STRUCT_TRAITS_MEMBER(device_id)
+  IPC_STRUCT_TRAITS_MEMBER(label)
+  IPC_STRUCT_TRAITS_MEMBER(group_id)
+IPC_STRUCT_TRAITS_END()