Use local ids for Surfaces APIs that can only apply to local surfaces

examples/surfaces_app/embedder.h

 // 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.
 
 #ifndef EXAMPLES_SURFACES_APP_EMBEDDER_H_
 #define EXAMPLES_SURFACES_APP_EMBEDDER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/surfaces/surface_id.h"
 #include "mojo/services/surfaces/public/interfaces/surfaces.mojom.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 class CompositorFrame;
 }
 
 namespace mojo {
 
 class ApplicationConnection;
 
 namespace examples {
 
 // Simple example of a surface embedder that embeds two other surfaces.
 class Embedder {
  public:
-  Embedder();
+  Embedder(uint32_t local_id, Surface* surface);
   ~Embedder();
 
-  void set_surface(Surface* surface) { surface_ = surface; }
-  void set_surface_id(SurfaceIdPtr id) { id_ = id.Clone(); }
-
   void ProduceFrame(cc::SurfaceId child_one,
                     cc::SurfaceId child_two,
                     const gfx::Size& child_size,
                     const gfx::Size& size,
                     int offset);
 
  private:
-  SurfaceIdPtr id_;
+  uint32_t local_id_;
   Surface* surface_;
 
   DISALLOW_COPY_AND_ASSIGN(Embedder);
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 #endif  // EXAMPLES_SURFACES_APP_EMBEDDER_H_