Populate a basic SystemProfileProto in UKM.

components/ukm/ukm_service_unittest.cc

 // Copyright 2017 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.
 
 #include "components/ukm/ukm_service.h"
 
 #include "base/test/test_simple_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/metrics/test_metrics_service_client.h"
 #include "components/prefs/testing_pref_service.h"
@@ skipping 55 matching lines @@
   service.EnableReporting();
   // Should init, generate a log, and unsuccessfully attempt an upload.
   task_runner_->RunPendingTasks();
   // Flushes the generated log to disk and generates a new one.
   service.Flush();
   EXPECT_EQ(GetPersistedLogCount(), 2);
   service.Purge();
   EXPECT_EQ(GetPersistedLogCount(), 0);
 }
 
+TEST_F(UkmServiceTest, PopulateSystemProfile) {
+  UkmService service(&prefs_, &client_);
+  Report report;
+  service.PopulateSystemProfile(&report);
+  EXPECT_TRUE(report.system_profile().has_build_timestamp());
+  EXPECT_TRUE(report.system_profile().has_app_version());
+  EXPECT_TRUE(report.system_profile().has_channel());
+  EXPECT_TRUE(report.system_profile().has_application_locale());
+  EXPECT_TRUE(report.system_profile().os().has_name());
+  EXPECT_TRUE(report.system_profile().os().has_version());
+  EXPECT_TRUE(report.system_profile().hardware().has_cpu_architecture());
+  EXPECT_TRUE(report.system_profile().hardware().has_system_ram_mb());
+  EXPECT_TRUE(report.system_profile().hardware().has_hardware_class());
+}
+
 }  // namespace ukm