Mozart: Directly associate the renderer with the view tree.

services/ui/view_manager/view_tree_state.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_STATE_H_
 #define SERVICES_UI_VIEW_MANAGER_VIEW_TREE_STATE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 32 matching lines @@
   mojo::ui::ViewTreeToken* view_tree_token() const {
     return view_tree_token_.get();
   }
 
   // Gets the view tree listener interface, never null.
   // Caller does not obtain ownership of the view tree listener.
   mojo::ui::ViewTreeListener* view_tree_listener() const {
     return view_tree_listener_.get();
   }
 
+  // The view tree's renderer.
+  mojo::gfx::composition::Renderer* renderer() const { return renderer_.get(); }
+  void set_renderer(mojo::gfx::composition::RendererPtr renderer) {
+    renderer_ = renderer.Pass();
+  }
+
   // Gets the root of the view tree, or null if there is no root.
   ViewStub* root() const { return root_.get(); }
 
   // Links the root of the view tree.
   void LinkRoot(uint32_t key, std::unique_ptr<ViewStub> root);
 
   // Unlinks the root of the view tree and returns it.
   std::unique_ptr<ViewStub> UnlinkRoot();
 
   // True if there is a pending layout request.
@@ skipping 12 matching lines @@
  private:
   mojo::ui::ViewTreeTokenPtr view_tree_token_;
   mojo::ui::ViewTreeListenerPtr view_tree_listener_;
 
   const std::string label_;
   mutable std::string formatted_label_cache_;
 
   std::unique_ptr<ViewTreeImpl> impl_;
   mojo::Binding<mojo::ui::ViewTree> view_tree_binding_;
 
+  mojo::gfx::composition::RendererPtr renderer_;
+
   std::unique_ptr<ViewStub> root_;
   bool layout_request_pending_ = false;
   bool layout_request_issued_ = false;
 
   base::WeakPtrFactory<ViewTreeState> weak_factory_;  // must be last
 
   DISALLOW_COPY_AND_ASSIGN(ViewTreeState);
 };
 
 std::ostream& operator<<(std::ostream& os, ViewTreeState* view_tree_state);
 
 }  // namespace view_manager
 
 #endif  // SERVICES_UI_VIEW_MANAGER_VIEW_TREE_STATE_H_