Populate a basic SystemProfileProto in UKM.

components/ukm/ukm_service_unittest.cc

Index: components/ukm/ukm_service_unittest.cc
diff --git a/components/ukm/ukm_service_unittest.cc b/components/ukm/ukm_service_unittest.cc
index 2bdf94af09436423626d165f7a58dd6f0d937781..ed520844529f27a78c495af2a95cd2c2b61759da 100644
--- a/components/ukm/ukm_service_unittest.cc
+++ b/components/ukm/ukm_service_unittest.cc
@@ -73,4 +73,19 @@ TEST_F(UkmServiceTest, PersistAndPurge) {
   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