Add a multi-threaded rendering example.

examples/ui/noodles/BUILD.gn

Index: examples/ui/noodles/BUILD.gn
diff --git a/examples/ui/shapes/BUILD.gn b/examples/ui/noodles/BUILD.gn
similarity index 72%
copy from examples/ui/shapes/BUILD.gn
copy to examples/ui/noodles/BUILD.gn
index 4462987eded83d71bed251cf75939c64c0be4ffe..75b87a151eb853d532bf0b64eebd60116671d9db 100644
--- a/examples/ui/shapes/BUILD.gn
+++ b/examples/ui/noodles/BUILD.gn
@@ -4,15 +4,19 @@
 
 import("//mojo/public/mojo_application.gni")
 
-mojo_native_application("shapes") {
-  output_name = "shapes_view"
+mojo_native_application("noodles") {
+  output_name = "noodles_view"
 
   sources = [
+    "frame.cc",
+    "frame.h",
     "main.cc",
-    "shapes_app.cc",
-    "shapes_app.h",
-    "shapes_view.cc",
-    "shapes_view.h",
+    "noodles_app.cc",
+    "noodles_app.h",
+    "noodles_view.cc",
+    "noodles_view.h",
+    "rasterizer.cc",
+    "rasterizer.h",
   ]
 
   deps = [
@@ -25,6 +29,7 @@ mojo_native_application("shapes") {
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/environment",
     "//mojo/public/cpp/system",
+    "//mojo/public/interfaces/application",
     "//mojo/services/geometry/interfaces",
     "//mojo/services/gfx/composition/interfaces",
     "//mojo/services/ui/views/interfaces",