Add a sample app that draws with Ganesh

examples/ganesh_app/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.
 
-# GYP version: mojo/mojo_services.gypi:mojo_surfaces_service
-shared_library("surfaces") {
-  output_name = "surfaces_service"
+shared_library("ganesh_app") {
   sources = [
-    "surfaces_impl.cc",
-    "surfaces_impl.h",
-    "surfaces_service_application.cc",
-    "surfaces_service_application.h",
-    "surfaces_service_impl.cc",
-    "surfaces_service_impl.h",
+    "ganesh_app.cc",
+    "painter.cc",
+    "painter.h",
   ]
 
   deps = [
     "//base",
     "//cc",
     "//cc/surfaces",
-    "//ui/gfx/geometry",
+    "//examples/surfaces_app:bindings",
+    "//examples/surfaces_app:util",
+    "//gpu/command_buffer/client:gles2_interface",
+    "//gpu/command_buffer/common",
+    "//gpu/skia_bindings",
     "//mojo/application",
-    "//mojo/cc",
+    "//mojo/common",
     "//mojo/converters/geometry",
     "//mojo/converters/surfaces",
     "//mojo/environment:chromium",
     "//mojo/public/c/system:for_shared_library",
+    "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/environment",
+    "//mojo/public/cpp/system",
+    "//mojo/public/cpp/utility",
     "//mojo/public/gles2:for_shared_library",
     "//mojo/services/public/interfaces/geometry",
     "//mojo/services/public/interfaces/gpu",
     "//mojo/services/public/interfaces/surfaces",
+    "//mojo/services/public/interfaces/surfaces:surface_id",
+    "//skia",
+    "//ui/gfx",
+    "//ui/gfx/geometry",
   ]
 }