Move ViewHostMsg_CreateWidget to mojom

content/common/render_message_filter.mojom

 // 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.
 
 module content.mojom;
 
+import "content/common/native_types.mojom";
 import "content/public/common/window_container_type.mojom";
 import "third_party/WebKit/public/platform/referrer.mojom";
 import "third_party/WebKit/public/web/window_features.mojom";
 import "ui/base/mojo/window_open_disposition.mojom";
 import "url/mojo/url.mojom";
 
 struct CreateNewWindowParams {
   // Routing ID of the view initiating the open.
   int32 opener_id;
 
@@ skipping 58 matching lines @@
 
 interface RenderMessageFilter {
   // Synchronously generates a new routing ID for the caller.
   [Sync] GenerateRoutingID() => (int32 routing_id);
 
   // Sent by the renderer when it is creating a new window.  The browser creates
   // a tab for it.  If |reply.route_id| is MSG_ROUTING_NONE, the view couldn't
   // be created.
   [Sync] CreateNewWindow(CreateNewWindowParams params)
       => (CreateNewWindowReply reply);
+
+  // Similar to CreateWindow, except used for sub-widgets, like <select>
+  // dropdowns.
+  [Sync] CreateNewWidget(int32 opener_id, content.mojom.WebPopupType popup_type)
+      => (int32 route_id);
 };