mus: Introduce AttachSurface to allow creating Surface prior to OnEmbed

components/mus/public/interfaces/window_tree.mojom

 // Copyright 2014 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 mus.mojom;
 
 import "components/mus/public/interfaces/compositor_frame.mojom";
 import "components/mus/public/interfaces/input_events.mojom";
 import "components/mus/public/interfaces/mus_constants.mojom";
 import "components/mus/public/interfaces/surface_id.mojom";
@@ skipping 97 matching lines @@
   // as any of their roots.
   SetWindowVisibility(uint32 window_id, bool visible) => (bool success);
 
   // Sets an individual named property. Setting an individual property to null
   // deletes the property.
   SetWindowProperty(uint32 change_id,
                     uint32 window_id,
                     string name,
                     array<uint8>? value);
 
-  // Requests a Surface for a particular window.
-  RequestSurface(uint32 window_id,
-                 SurfaceType type,
-                 Surface& surface,
-                 SurfaceClient client);
+  // Attaches a Surface to a particular window.
+  AttachSurface(uint32 window_id,
+                SurfaceType type,
+                Surface& surface,
+                SurfaceClient client);
 
   // Reparents a window.
   // This fails for any of the following reasons:
   // . |parent| or |child| does not identify a valid window.
   // . |child| is an ancestor of |parent|.
   // . |child| is already a child of |parent|.
   //
   // This may result in a connection getting OnWindowDeleted(). See
   // RemoveWindowFromParent for details.
   AddWindow(uint32 parent, uint32 child) => (bool success);
@@ skipping 186 matching lines @@
   // WindowManager interface once we get associated interfaces.
 
   // Calls to SetWindowBounds() for windows owned by the window manager end up
   // here. The window manager should reply with WmResponse() as appropriate.
   WmSetBounds(uint32 change_id, uint32 window_id, mojo.Rect bounds);
   WmSetProperty(uint32 change_id,
                 uint32 window_id,
                 string name,
                 array<uint8>? value);
 };