Gather stability prefs into managing objects.
This collects code reading and writing stability prefs from
MetricsLog and MetricsService into StabilityMetricsProvider
and EnvironmentRecorder objects.
Also removes the obsolete stability prefs which are now unneeded.
BUG=693676
Review-Url: https://codereview.chromium.org/2687393004
Cr-Commit-Position: refs/heads/master@{#452301}
diff --git a/components/metrics/environment_recorder.h b/components/metrics/environment_recorder.h
new file mode 100644
index 0000000..0042d2e
--- /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 the buildtime of the current binary and version in prefs.
+ 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_
