Mozart: Directly associate the renderer with the view tree.

services/ui/view_manager/view_tree_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_UI_VIEW_MANAGER_VIEW_TREE_IMPL_H_
 #define SERVICES_UI_VIEW_MANAGER_VIEW_TREE_IMPL_H_
 
 #include "base/macros.h"
 #include "mojo/common/binding_set.h"
 #include "mojo/services/ui/views/interfaces/view_trees.mojom.h"
 
 namespace view_manager {
 
 class ViewRegistry;
 class ViewTreeState;
 
 // ViewTree interface implementation.
 // This object is owned by its associated ViewTreeState.
 class ViewTreeImpl : public mojo::ui::ViewTree, public mojo::ServiceProvider {
  public:
   ViewTreeImpl(ViewRegistry* registry, ViewTreeState* state);
   ~ViewTreeImpl() override;
 
  private:
   // |ViewTree|:
   void GetToken(const GetTokenCallback& callback) override;
   void GetServiceProvider(
       mojo::InterfaceRequest<mojo::ServiceProvider> service_provider) override;
+  void SetRenderer(mojo::InterfaceHandle<mojo::gfx::composition::Renderer>
+                       renderer) override;
   void RequestLayout() override;
   void SetRoot(
       uint32_t root_key,
       mojo::InterfaceHandle<mojo::ui::ViewOwner> root_view_owner) override;
   void ResetRoot(mojo::InterfaceRequest<mojo::ui::ViewOwner>
                      transferred_view_owner_request) override;
   void LayoutRoot(mojo::ui::ViewLayoutParamsPtr root_layout_params,
                   const LayoutRootCallback& callback) override;
 
   // |ServiceProvider|:
   void ConnectToService(const mojo::String& service_name,
                         mojo::ScopedMessagePipeHandle client_handle) override;
 
   ViewRegistry* const registry_;
   ViewTreeState* const state_;
   mojo::BindingSet<mojo::ServiceProvider> service_provider_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewTreeImpl);
 };
 
 }  // namespace view_manager
 
 #endif  // SERVICES_UI_VIEW_MANAGER_VIEW_TREE_IMPL_H_