Persist core system profile during startup.

components/metrics/persistent_system_profile_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/metrics/persistent_system_profile.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/persistent_memory_allocator.h"
 #include "base/rand_util.h"
@@ skipping 73 matching lines @@
   for (size_t i = 0; i < kRecordSize; ++i)
     EXPECT_EQ(buffer[i], record[i]);
 }
 
 TEST_F(PersistentSystemProfileTest, ProfileStorage) {
   SystemProfileProto proto1;
   SystemProfileProto::FieldTrial* trial = proto1.add_field_trial();
   trial->set_name_id(123);
   trial->set_group_id(456);
 
-  persistent_profile()->SetSystemProfile(proto1);
+  persistent_profile()->SetSystemProfile(proto1, false);
 
   SystemProfileProto proto2;
   ASSERT_TRUE(PersistentSystemProfile::HasSystemProfile(*memory_allocator()));
   ASSERT_TRUE(
       PersistentSystemProfile::GetSystemProfile(*memory_allocator(), &proto2));
   ASSERT_EQ(1, proto2.field_trial_size());
   EXPECT_EQ(123U, proto2.field_trial(0).name_id());
   EXPECT_EQ(456U, proto2.field_trial(0).group_id());
 
   // Check that the profile can be overwritten.
 
   trial = proto1.add_field_trial();
   trial->set_name_id(78);
   trial->set_group_id(90);
 
-  persistent_profile()->SetSystemProfile(proto1);
+  persistent_profile()->SetSystemProfile(proto1, true);
 
   ASSERT_TRUE(
       PersistentSystemProfile::GetSystemProfile(*memory_allocator(), &proto2));
+  ASSERT_EQ(2, proto2.field_trial_size());
+  EXPECT_EQ(123U, proto2.field_trial(0).name_id());
+  EXPECT_EQ(456U, proto2.field_trial(0).group_id());
+  EXPECT_EQ(78U, proto2.field_trial(1).name_id());
+  EXPECT_EQ(90U, proto2.field_trial(1).group_id());
+
+  // Check that the profile won't be overwritten by a new non-complete profile.
+
+  trial = proto1.add_field_trial();
+  trial->set_name_id(0xC0DE);
+  trial->set_group_id(0xFEED);
+
+  persistent_profile()->SetSystemProfile(proto1, false);
+
+  ASSERT_TRUE(
+      PersistentSystemProfile::GetSystemProfile(*memory_allocator(), &proto2));
   ASSERT_EQ(2, proto2.field_trial_size());
   EXPECT_EQ(123U, proto2.field_trial(0).name_id());
   EXPECT_EQ(456U, proto2.field_trial(0).group_id());
   EXPECT_EQ(78U, proto2.field_trial(1).name_id());
   EXPECT_EQ(90U, proto2.field_trial(1).group_id());
 }
 
 }  // namespace metrics