Require an explicit ServiceName annotation for interfaces in C++.

mojo/services/surfaces/interfaces/display.mojom

 // Copyright 2015 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.
 
 [DartPackage="mojo_services"]
 module mojo;
 
 import "gpu/interfaces/context_provider.mojom";
 import "gpu/interfaces/viewport_parameter_listener.mojom";
 import "surfaces/interfaces/surfaces.mojom";
 
 interface Display {
   // Submits a new frame to the display to be drawn when possible. The callback
   // will be run after the frame has been issued to the display but possibly
   // before the frame is actually visible.
   //
   // The Display will be resized to the size of the last entry in |frame|'s
   // |passes| list (aka the root pass).
   //
   // Any resources submitted in the frame will be returned via the
   // ResourceReturner associated with the Display at construction time.
   SubmitFrame(Frame frame) => ();
 };
 
 // DisplayFactory creates new Display instances.
+[ServiceName="mojo::DisplayFactory"]
 interface DisplayFactory {
   // Create associates a Display that will draw to contexts produced by
   // |context_provider|. Any resources submitted to the display will be
   // returned via the |returner|, if supplied.
   Create(ContextProvider context_provider,
          ResourceReturner? returner,
          Display& display_request);
 };