Added test files for SystemInfo.m and OmahaXMLRequest.m.

chrome/installer/mac/app/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-executable("downloader") {
+import("//testing/test.gni")
+
+static_library("mac_installer_base") {
   sources = [
     "DownloadDelegate.m",
     "Downloader.m",
     "NetworkCommunication.m",
     "OmahaCommunication.m",
     "OmahaXMLParser.m",
     "OmahaXMLRequest.m",
     "SystemInfo.m",
+  ]
+}
+
+executable("mac_installer") {
+  sources = [
     "main.m",
   ]
+  deps = [
+    ":mac_installer_base",
+  ]
   libs = [ "Foundation.framework" ]
 }
+
+test("mac_installer_test") {
+  testonly = true
+  sources = [
+    "testing/OmahaXMLRequest_test.mm",
+    "testing/SystemInfo_test.mm",
+  ]
+  deps = [
+    ":mac_installer_base",
+    "//base/test:run_all_unittests",
+  ]
+  libs = [ "Foundation.framework" ]
+}