mozart: Add a simple tiling view manager.

examples/ui/tile/tile_view.h

Index: examples/ui/tile/tile_view.h
diff --git a/examples/ui/spinning_cube/spinning_cube_view.h b/examples/ui/tile/tile_view.h
similarity index 50%
copy from examples/ui/spinning_cube/spinning_cube_view.h
copy to examples/ui/tile/tile_view.h
index 1a5b7fe0185870af56982c8e8234887865d6eca8..a0132cf9ac05ead6cf5283ab759ee15555a61796 100644
--- a/examples/ui/spinning_cube/spinning_cube_view.h
+++ b/examples/ui/tile/tile_view.h
@@ -2,25 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef EXAMPLES_UI_SPINNING_CUBE_SPINNING_CUBE_VIEW_H_
-#define EXAMPLES_UI_SPINNING_CUBE_SPINNING_CUBE_VIEW_H_
+#ifndef EXAMPLES_UI_TILE_TILE_VIEW_H_
+#define EXAMPLES_UI_TILE_TILE_VIEW_H_
 
+#include <map>
 #include <memory>
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
-#include "examples/spinning_cube/spinning_cube.h"
-#include "mojo/gpu/gl_context.h"
-#include "mojo/gpu/gl_context_owner.h"
-#include "mojo/gpu/gl_texture.h"
-#include "mojo/gpu/texture_cache.h"
-#include "mojo/gpu/texture_uploader.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
-#include "mojo/services/surfaces/interfaces/quads.mojom.h"
+#include "mojo/services/geometry/interfaces/geometry.mojom.h"
 #include "mojo/services/surfaces/interfaces/surfaces.mojom.h"
 #include "mojo/services/ui/views/interfaces/view_manager.mojom.h"
 #include "mojo/services/ui/views/interfaces/view_provider.mojom.h"
@@ -28,14 +23,27 @@
 
 namespace examples {
 
-class SpinningCubeView : public mojo::ui::View {
+class TileView : public mojo::ui::View {
  public:
-  SpinningCubeView(mojo::ApplicationImpl* app,
-                   const mojo::ui::ViewProvider::CreateViewCallback& callback);
+  TileView(mojo::ApplicationImpl* app_impl_,
+           const std::vector<std::string>& view_urls,
+           const mojo::ui::ViewProvider::CreateViewCallback& callback);
 
-  ~SpinningCubeView() override;
+  ~TileView() override;
 
  private:
+  struct ViewData {
+    explicit ViewData(const std::string& url);
+    ~ViewData();
+
+    const std::string url;
+
+    bool layout_pending;
+    mojo::ui::ViewLayoutParamsPtr layout_params;
+    mojo::ui::ViewLayoutInfoPtr layout_info;
+    mojo::Rect layout_bounds;
+  };
+
   // |View|:
   void OnLayout(mojo::ui::ViewLayoutParamsPtr layout_params,
                 mojo::Array<uint32_t> children_needing_layout,
@@ -46,38 +54,41 @@ class SpinningCubeView : public mojo::ui::View {
   void OnSurfaceIdNamespaceAvailable(uint32_t id_namespace);
 
   void InitView();
-
-  void InitCube();
-  void DrawCube();
-  void OnSurfaceSubmitted();
-  void ScheduleDraw();
-
+  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();
+
+  mojo::ApplicationImpl* app_impl_;
+  std::vector<std::string> view_urls_;
   mojo::ui::ViewProvider::CreateViewCallback callback_;
   mojo::StrongBinding<mojo::ui::View> binding_;
 
-  mojo::GLContextOwner context_owner_;
-  mojo::ResourceReturnerPtr resource_returner_;  // must be before texture cache
-  mojo::TextureCache texture_cache_;
-
   mojo::SurfacePtr surfaces_;
   mojo::SurfaceIdPtr surface_id_;
   uint32_t surface_id_namespace_;
 
   mojo::ui::ViewManagerPtr view_manager_;
   mojo::ui::ViewHostPtr view_host_;
-  mojo::ServiceProviderPtr view_service_provider_;
 
-  mojo::Size size_;
+  std::map<uint32_t, std::unique_ptr<ViewData>> views_;
 
-  SpinningCube cube_;
-  MojoTimeTicks last_draw_;
-  bool draw_scheduled_;
+  mojo::Size size_;
+  OnLayoutCallback pending_layout_callback_;
+  uint32_t pending_child_layout_count_;
+  bool frame_pending_;
 
-  base::WeakPtrFactory<SpinningCubeView> weak_ptr_factory_;
+  base::WeakPtrFactory<TileView> weak_ptr_factory_;
 
-  DISALLOW_COPY_AND_ASSIGN(SpinningCubeView);
+  DISALLOW_COPY_AND_ASSIGN(TileView);
 };
 
 }  // namespace examples
 
-#endif  // EXAMPLES_UI_SPINNING_CUBE_SPINNING_CUBE_VIEW_H_
+#endif  // EXAMPLES_UI_TILE_TILE_VIEW_H_