Add a Display and ContextProvider concept to mojom, use to recreate

examples/spinning_cube/spinning_cube_app.cc

 // Copyright 2013 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.
 
 #include <stdio.h>
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "examples/spinning_cube/gles2_client_impl.h"
@@ skipping 20 matching lines @@
     // TODO(darin): Fix shutdown so we don't need to leak this.
     mojo_ignore_result(gles2_client_.release());
   }
 
   void Initialize(mojo::ApplicationImpl* app) override {
     app->ConnectToService("mojo:native_viewport_service", &viewport_);
     viewport_.set_error_handler(this);
 
     SetEventDispatcher();
 
-    // TODO(jamesr): Should be mojo:gpu_service
-    app->ConnectToService("mojo:native_viewport_service", &gpu_service_);
-
     mojo::SizePtr size(mojo::Size::New());
     size->width = 800;
     size->height = 600;
-    viewport_->Create(size.Pass(),
-                      base::Bind(&SpinningCubeApp::OnCreatedNativeViewport,
-                                 base::Unretained(this)));
+    viewport_->Create(
+        size.Clone(),
+        base::Bind(&SpinningCubeApp::OnMetricsChanged, base::Unretained(this)));
     viewport_->Show();
+    mojo::ContextProviderPtr onscreen_context_provider;
+    viewport_->GetContextProvider(GetProxy(&onscreen_context_provider));
+
+    gles2_client_.reset(new GLES2ClientImpl(onscreen_context_provider.Pass()));
+    gles2_client_->SetSize(*size);
   }
 
   void OnMetricsChanged(mojo::ViewportMetricsPtr metrics) {
     assert(metrics);
-    if (gles2_client_)
-      gles2_client_->SetSize(*metrics->size);
+    gles2_client_->SetSize(*metrics->size);
     viewport_->RequestMetrics(
         base::Bind(&SpinningCubeApp::OnMetricsChanged, base::Unretained(this)));
   }
 
   void OnEvent(mojo::EventPtr event,
                const mojo::Callback<void()>& callback) override {
     assert(event);
     if (event->location_data && event->location_data->in_view_location)
       gles2_client_->HandleInputEvent(*event);
     callback.Run();
   }
 
  private:
   void SetEventDispatcher() {
     mojo::NativeViewportEventDispatcherPtr ptr;
     dispatcher_binding_.Bind(GetProxy(&ptr));
     viewport_->SetEventDispatcher(ptr.Pass());
   }
 
-  void OnCreatedNativeViewport(uint64_t native_viewport_id,
-                               mojo::ViewportMetricsPtr metrics) {
-    mojo::ViewportParameterListenerPtr listener;
-    mojo::CommandBufferPtr command_buffer;
-    // TODO(jamesr): Output to a surface instead.
-    gpu_service_->CreateOnscreenGLES2Context(
-        native_viewport_id, metrics->size.Clone(), GetProxy(&command_buffer),
-        listener.Pass());
-    gles2_client_.reset(new GLES2ClientImpl(command_buffer.Pass()));
-    gles2_client_->SetSize(*metrics->size);
-    viewport_->RequestMetrics(
-        base::Bind(&SpinningCubeApp::OnMetricsChanged, base::Unretained(this)));
-  }
-
   // ErrorHandler implementation.
   void OnConnectionError() override { mojo::RunLoop::current()->Quit(); }
 
   scoped_ptr<GLES2ClientImpl> gles2_client_;
   mojo::NativeViewportPtr viewport_;
-  mojo::GpuPtr gpu_service_;
+  mojo::ContextProviderPtr onscreen_context_provider_;
   mojo::Binding<NativeViewportEventDispatcher> dispatcher_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(SpinningCubeApp);
 };
 
 }  // namespace examples
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunner runner(new examples::SpinningCubeApp);
   return runner.Run(shell_handle);
 }