Mojo: more idiomatic C++ bindings

mojo/examples/compositor_app/compositor_app.cc

Index: mojo/examples/compositor_app/compositor_app.cc
diff --git a/mojo/examples/compositor_app/compositor_app.cc b/mojo/examples/compositor_app/compositor_app.cc
index f927cc232e7f2c58039a9139e9bdec03f12d0939..78242411311de31f1b9f41a1919ad6bd23a3cf5b 100644
--- a/mojo/examples/compositor_app/compositor_app.cc
+++ b/mojo/examples/compositor_app/compositor_app.cc
@@ -9,7 +9,6 @@
 #include "base/message_loop/message_loop.h"
 #include "mojo/examples/compositor_app/compositor_host.h"
 #include "mojo/geometry/geometry_type_converters.h"
-#include "mojo/public/cpp/bindings/allocation_scope.h"
 #include "mojo/public/cpp/gles2/gles2.h"
 #include "mojo/public/cpp/shell/application.h"
 #include "mojo/public/cpp/system/core.h"
@@ -33,12 +32,10 @@ namespace examples {
 class SampleApp : public Application, public NativeViewportClient {
  public:
   explicit SampleApp(MojoHandle shell_handle) : Application(shell_handle) {
-    AllocationScope scope;
-
     ConnectTo("mojo:mojo_native_viewport_service", &viewport_);
     viewport_.set_client(this);
 
-    viewport_->Create(gfx::Rect(10, 10, 800, 600));
+    viewport_->Create(Rect::From(gfx::Rect(10, 10, 800, 600)));
     viewport_->Show();
 
     MessagePipe gles2_pipe;
@@ -53,11 +50,11 @@ class SampleApp : public Application, public NativeViewportClient {
     base::MessageLoop::current()->Quit();
   }
 
-  virtual void OnBoundsChanged(const Rect& bounds) OVERRIDE {
-    host_->SetSize(bounds.size());
+  virtual void OnBoundsChanged(RectPtr bounds) OVERRIDE {
+    host_->SetSize(bounds->size.To<gfx::Size>());
   }
 
-  virtual void OnEvent(const Event& event,
+  virtual void OnEvent(EventPtr event,
                        const mojo::Callback<void()>& callback) OVERRIDE {
     callback.Run();
   }