Mozart: Directly associate the renderer with the view tree.

services/gfx/compositor/renderer_impl.h

 // 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.
 
 #ifndef SERVICES_GFX_COMPOSITOR_RENDERER_IMPL_H_
 #define SERVICES_GFX_COMPOSITOR_RENDERER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "mojo/common/binding_set.h"
@@ skipping 17 matching lines @@
 
   void set_connection_error_handler(const base::Closure& handler) {
     renderer_binding_.set_connection_error_handler(handler);
   }
 
  private:
   // |Renderer|:
   void SetRootScene(mojo::gfx::composition::SceneTokenPtr scene_token,
                     uint32 scene_version,
                     mojo::RectPtr viewport) override;
+  void ResetRootScene() override;
   void GetHitTester(mojo::InterfaceRequest<mojo::gfx::composition::HitTester>
                         hit_tester_request) override;
 
   // |HitTester|:
   void HitTest(mojo::PointPtr point, const HitTestCallback& callback) override;
 
   CompositorEngine* const engine_;
   RendererState* const state_;
   mojo::Binding<mojo::gfx::composition::Renderer> renderer_binding_;
   mojo::BindingSet<mojo::gfx::composition::HitTester> hit_tester_bindings;
 
   DISALLOW_COPY_AND_ASSIGN(RendererImpl);
 };
 
 }  // namespace compositor
 
 #endif  // SERVICES_GFX_COMPOSITOR_RENDERER_IMPL_H_