Restructure public side of view_manager service.

examples/bitmap_uploader/BUILD.gn

Index: examples/bitmap_uploader/BUILD.gn
diff --git a/examples/bitmap_uploader/BUILD.gn b/examples/bitmap_uploader/BUILD.gn
index ec7b877f369e1a782274cb7e9dbf7d7ff7fa93f2..49a2581b2aaf407cc59a6efea9aa87e46468432e 100644
--- a/examples/bitmap_uploader/BUILD.gn
+++ b/examples/bitmap_uploader/BUILD.gn
@@ -20,11 +20,11 @@ source_set("bitmap_uploader") {
     "//mojo/public/interfaces/application",
     "//mojo/services/public/cpp/geometry",
     "//mojo/services/public/cpp/surfaces",
-    "//mojo/services/public/cpp/view_manager",
     "//mojo/services/public/interfaces/geometry",
     "//mojo/services/public/interfaces/input_events:input_events",
     "//mojo/services/public/interfaces/surfaces:surface_id",
-    "//mojo/services/public/interfaces/view_manager",
+    "//mojo/services/view_manager/public/cpp",
+    "//mojo/services/view_manager/public/interfaces",
     "//ui/gfx/geometry",
   ]
 }