Reify view ownership as a message pipe.

examples/ui/tile/tile_view.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 EXAMPLES_UI_TILE_TILE_VIEW_H_
 #define EXAMPLES_UI_TILE_TILE_VIEW_H_
 
 #include <map>
 #include <memory>
 
+#include "mojo/services/ui/views/interfaces/view_provider.mojom.h"
 #include "mojo/ui/base_view.h"
 
 namespace examples {
 
 class TileView : public mojo::ui::BaseView {
  public:
   TileView(mojo::ApplicationImpl* app_impl_,
-           const std::vector<std::string>& view_urls,
-           const mojo::ui::ViewProvider::CreateViewCallback& callback);
+           mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
+           const std::vector<std::string>& view_urls);
 
   ~TileView() override;
 
  private:
   struct ViewData {
     explicit ViewData(const std::string& url, uint32_t key);
     ~ViewData();
 
     const std::string url;
     const uint32_t key;
 
     bool layout_pending;
     mojo::ui::ViewLayoutParamsPtr layout_params;
     mojo::ui::ViewLayoutInfoPtr layout_info;
     mojo::Rect layout_bounds;
   };
 
   // |BaseView|:
   void OnLayout(mojo::ui::ViewLayoutParamsPtr layout_params,
                 mojo::Array<uint32_t> children_needing_layout,
                 const OnLayoutCallback& callback) override;
   void OnChildUnavailable(uint32_t child_key,
                           const OnChildUnavailableCallback& callback) override;
 
   void ConnectViews();
-  void OnChildConnectionError(uint32_t child_key, const std::string& url);
-  void OnChildCreated(uint32_t child_key,
-                      const std::string& url,
-                      mojo::ui::ViewProviderPtr provider,
-                      mojo::ui::ViewTokenPtr token);
   void OnChildLayoutFinished(uint32_t child_key,
                              mojo::ui::ViewLayoutInfoPtr child_layout_info);
   void FinishLayout();
 
   void OnFrameSubmitted();
 
   std::vector<std::string> view_urls_;
   std::map<uint32_t, std::unique_ptr<ViewData>> views_;
 
   mojo::Size size_;
   OnLayoutCallback pending_layout_callback_;
   uint32_t pending_child_layout_count_ = 0u;
 
   DISALLOW_COPY_AND_ASSIGN(TileView);
 };
 
 }  // namespace examples
 
 #endif  // EXAMPLES_UI_TILE_TILE_VIEW_H_