Restructure public side of geometry service.

mojo/services/geometry/public/cpp/BUILD.gn

Index: mojo/services/geometry/public/cpp/BUILD.gn
diff --git a/mojo/services/public/cpp/geometry/BUILD.gn b/mojo/services/geometry/public/cpp/BUILD.gn
similarity index 74%
rename from mojo/services/public/cpp/geometry/BUILD.gn
rename to mojo/services/geometry/public/cpp/BUILD.gn
index 349a86505a346d7d65fa81471d626eefea574488..ab410af3de2670c398afc834c108ea15fe20f46e 100644
--- a/mojo/services/public/cpp/geometry/BUILD.gn
+++ b/mojo/services/geometry/public/cpp/BUILD.gn
@@ -2,12 +2,12 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("geometry") {
+source_set("cpp") {
   sources = [
     "geometry_util.h",
   ]
 
   deps = [
-    "//mojo/services/public/interfaces/geometry",
+    "//mojo/services/geometry/public/interfaces",
   ]
 }