Add initial utilities to base/

This change adds IPv4Address and IPv6Address.

Change-Id: Id107842422c32b8c9232c887668504a16feb0a90
Reviewed-on: https://chromium-review.googlesource.com/1080730
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index ba4b065..a4ec72a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -3,7 +3,12 @@
 # found in the LICENSE file.
 
 group("gn_all") {
-  deps = [ "//platform" ]
+  testonly = true
+
+  deps = [
+    "//base:base_unittests",
+    "//platform",
+  ]
 }
 
 executable("hello") {