Rename sample_app -> spinning_cube.

examples/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 
 group("examples") {
   testonly = true
 
   deps = [
     "//examples/apptest",
     "//examples/browser",
     "//examples/content_handler_demo",
     "//examples/dart/console_example",
     "//examples/dart/hello_world/hello",
     "//examples/dart/hello_world/world",
     "//examples/dart/wget",
     "//examples/echo",
     "//examples/embedded_app",
     "//examples/forwarding_content_handler",
     "//examples/ganesh_app",
     "//examples/http_handler",
     "//examples/indirect_service",
     "//examples/js/maps",
     "//examples/nesting_app",
     "//examples/png_viewer",
     "//examples/recipes",
     "//examples/recursive_content_handler",
-    "//examples/sample_app",
     "//examples/sky_compositor_app",
+    "//examples/spinning_cube",
     "//examples/surfaces_app",
     "//examples/wget",
     "//examples/window_manager",
     "//examples/wm_flow",
   ]
 
   if (!is_android) {
     deps += [ "//examples/pdf_viewer" ]
   }
 
   if (is_android) {
     deps += [
       "//examples/android",
       "//examples/device_name",
     ]
   }
 
   if (is_linux) {
     deps += [ "//examples/python" ]
   }
 }