Split surface id and simplify connecting to surfaces service

examples/surfaces_app/child_impl.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_CHILD_IMPL_H_
 #define EXAMPLES_SURFACES_APP_CHILD_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "examples/surfaces_app/child.mojom.h"
 #include "mojo/public/cpp/bindings/string.h"
 #include "mojo/services/surfaces/public/interfaces/surface_id.mojom.h"
 #include "mojo/services/surfaces/public/interfaces/surfaces.mojom.h"
 #include "mojo/services/surfaces/public/interfaces/surfaces_service.mojom.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 class CompositorFrame;
 }
 
 namespace mojo {
 
 class ApplicationConnection;
 
-namespace surfaces {
-class Surface;
-}
-
 namespace examples {
 
 // Simple example of a child app using surfaces.
 class ChildImpl : public InterfaceImpl<Child>, public SurfaceClient {
  public:
   class Context {
    public:
     virtual ApplicationConnection* ShellConnection(
         const mojo::String& application_url) = 0;
   };
   explicit ChildImpl(ApplicationConnection* surfaces_service_connection);
-  virtual ~ChildImpl();
-
-  // SurfaceClient implementation
-  virtual void ReturnResources(
-      Array<ReturnedResourcePtr> resources) override;
+  ~ChildImpl() override;
 
  private:
+  // SurfaceClient implementation
+  void SetIdNamespace(uint32_t id_namespace) override;
+  void ReturnResources(Array<ReturnedResourcePtr> resources) override;
+
   // Child implementation.
-  virtual void ProduceFrame(
+  void ProduceFrame(
       ColorPtr color,
       SizePtr size,
       const mojo::Callback<void(SurfaceIdPtr id)>& callback) override;
 
-  void SurfaceConnectionCreated(SurfacePtr surface, uint32_t id_namespace);
-  void Draw();
-
-  SkColor color_;
-  gfx::Size size_;
   scoped_ptr<cc::SurfaceIdAllocator> allocator_;
-  SurfacesServicePtr surfaces_service_;
   SurfacePtr surface_;
   cc::SurfaceId id_;
-  mojo::Callback<void(SurfaceIdPtr id)> produce_callback_;
-  base::WeakPtrFactory<ChildImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildImpl);
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 #endif  // EXAMPLES_SURFACES_APP_CHILD_IMPL_H_