Gather stability prefs into managing objects.

components/metrics/environment_recorder.h

Index: components/metrics/environment_recorder.h
diff --git a/components/metrics/environment_recorder.h b/components/metrics/environment_recorder.h
new file mode 100644
index 0000000000000000000000000000000000000000..c83a91c098e19f7f96b57c4c008777ca7aca7491
--- /dev/null
+++ b/components/metrics/environment_recorder.h
@@ -0,0 +1,59 @@
+// 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.
+
+#ifndef COMPONENTS_METRICS_ENVIRONMENT_RECORDER_H_
+#define COMPONENTS_METRICS_ENVIRONMENT_RECORDER_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+class PrefService;
+class PrefRegistrySimple;
+
+namespace metrics {
+
+class SystemProfileProto;
+
+// Stores system profile information to prefs for creating stability logs
+// in the next launch of chrome, and reads data from previous launches.
+class EnvironmentRecorder {
+ public:
+  explicit EnvironmentRecorder(PrefService* local_state);
+  ~EnvironmentRecorder();
+
+  // Serializes the system profile and records it in prefs for the next
+  // session.  Returns the uncompressed serialized proto for passing to crash
+  // reports, or the empty string if the proto can't be serialized.
+  std::string SerializeAndRecordEnvironmentToPrefs(
+      const SystemProfileProto& system_profile);
+
+  // Loads the system_profile data stored in a previous chrome session, and
+  // stores it in the |system_profile| object.
+  // Returns true iff a system profile was successfully read.
+  bool LoadEnvironmentFromPrefs(SystemProfileProto* system_profile);
+
+  // Deletes system profile data from prefs.
+  void ClearEnvironmentFromPrefs();
+
+  // Stores a buildtime and version in prefs.

[Alexei Svitkine (slow), 2017/02/17 16:02:22]

Please expand comment to mention what buildtime is.

[Steven Holte, 2017/02/17 20:21:32]

Done.

+  void SetBuildtimeAndVersion(int64_t buildtime, const std::string& version);
+
+  // Gets the buildtime stored in prefs.
+  int64_t GetLastBuildtime();
+
+  // Gets the version stored in prefs.
+  std::string GetLastVersion();
+
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
+ private:
+  PrefService* local_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(EnvironmentRecorder);
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_ENVIRONMENT_RECORDER_H_