Creates a BattOrConnection for communicating with the BattOr

tools/battor_agent/BUILD.gn

Index: tools/battor_agent/BUILD.gn
diff --git a/tools/battor_agent/BUILD.gn b/tools/battor_agent/BUILD.gn
index c808409973393e2cbf4105c6db9233f8538e498d..98eda34e130b41d0d04fc83d24dcaaab8284b095 100644
--- a/tools/battor_agent/BUILD.gn
+++ b/tools/battor_agent/BUILD.gn
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//testing/test.gni")
+
 executable("battor_agent") {
   sources = [
     "battor_agent_bin.cc",
@@ -14,14 +16,30 @@ executable("battor_agent") {
   ]
 }
 
-static_library("battor_agent_lib") {
+source_set("battor_agent_lib") {
   sources = [
     "battor_agent.cc",
     "battor_agent.h",
+    "battor_connection.cc",
+    "battor_connection.h",
     "battor_error.h",
   ]
   deps = [
     "//base",
     "//device/serial",
+    "//net",
+  ]
+}
+
+test("battor_agent_unittests") {
+  sources = [
+    "battor_connection_unittest.cc",
+  ]
+  deps = [
+    ":battor_agent_lib",
+    "//base/test:run_all_unittests",
+    "//device/serial:test_support",
+    "//mojo/public/c/system:for_shared_library",
+    "//testing/gtest",
   ]
 }