mozart: Add a simple tiling view manager.

examples/ui/tile/BUILD.gn

Index: examples/ui/tile/BUILD.gn
diff --git a/examples/ui/spinning_cube/BUILD.gn b/examples/ui/tile/BUILD.gn
similarity index 75%
copy from examples/ui/spinning_cube/BUILD.gn
copy to examples/ui/tile/BUILD.gn
index db71418089d8934c3193b7262819bb12ce0c5531..1727e0955daa8cd00ef4390ca3b72ed082641726 100644
--- a/examples/ui/spinning_cube/BUILD.gn
+++ b/examples/ui/tile/BUILD.gn
@@ -4,20 +4,19 @@
 
 import("//mojo/public/mojo_application.gni")
 
-mojo_native_application("spinning_cube") {
-  output_name = "spinning_cube_view"
+mojo_native_application("tile") {
+  output_name = "tile_view"
 
   sources = [
     "main.cc",
-    "spinning_cube_app.cc",
-    "spinning_cube_app.h",
-    "spinning_cube_view.cc",
-    "spinning_cube_view.h",
+    "tile_app.cc",
+    "tile_app.h",
+    "tile_view.cc",
+    "tile_view.h",
   ]
 
   deps = [
     "//base",
-    "//examples/spinning_cube:lib",
     "//mojo/application",
     "//mojo/common",
     "//mojo/environment:chromium",
@@ -29,7 +28,9 @@ mojo_native_application("spinning_cube") {
     "//mojo/public/cpp/system",
     "//mojo/services/geometry/interfaces",
     "//mojo/services/input_events/interfaces",
+    "//mojo/services/surfaces/cpp",
     "//mojo/services/surfaces/interfaces",
     "//mojo/services/ui/views/interfaces",
+    "//url",
   ]
 }