Update the UI examples.

examples/ui/png_viewer/BUILD.gn

Index: examples/ui/png_viewer/BUILD.gn
diff --git a/examples/png_viewer/BUILD.gn b/examples/ui/png_viewer/BUILD.gn
similarity index 62%
rename from examples/png_viewer/BUILD.gn
rename to examples/ui/png_viewer/BUILD.gn
index 16061bc0fbb64379cf576c93b78e22139e14deb0..6ff4b26ef47afd700bc92ba35992ebf51b08746c 100644
--- a/examples/png_viewer/BUILD.gn
+++ b/examples/ui/png_viewer/BUILD.gn
@@ -10,15 +10,23 @@ mojo_native_application("png_viewer") {
   ]
 
   deps = [
-    "//examples/bitmap_uploader",
     "//mojo/application",
-    "//mojo/application:content_handler",
     "//mojo/data_pipe_utils",
+    "//mojo/environment:chromium",
+    "//mojo/gpu",
+    "//mojo/public/c/gpu",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/utility",
     "//mojo/services/content_handler/interfaces",
+    "//mojo/services/geometry/interfaces",
+    "//mojo/services/gfx/composition/interfaces",
     "//mojo/services/network/interfaces",
-    "//mojo/services/view_manager/cpp",
+    "//mojo/services/ui/views/interfaces",
+    "//mojo/skia",
+    "//mojo/ui",
+    "//mojo/ui:content",
+    "//mojo/ui:ganesh",
+    "//mojo/ui:gl",
     "//ui/gfx",
   ]
 }