Add stricter tests for RapporService::LoadSecret

components/rappor/rappor_prefs.h

Index: components/rappor/rappor_prefs.h
diff --git a/components/rappor/rappor_prefs.h b/components/rappor/rappor_prefs.h
new file mode 100644
index 0000000000000000000000000000000000000000..ba9d7fc1055ad1b43c118b4d0cfeba75a29b31ed
--- /dev/null
+++ b/components/rappor/rappor_prefs.h
@@ -0,0 +1,45 @@
+// Copyright 2015 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_RAPPOR_RAPPOR_PREFS_H_
+#define COMPONENTS_RAPPOR_RAPPOR_PREFS_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+class PrefService;
+class PrefRegistrySimple;
+
+namespace rappor {
+
+namespace internal {
+
+enum LoadResult {
+  LOAD_SUCCESS = 0,
+  LOAD_EMPTY_VALUE,
+  LOAD_CORRUPT_VALUE,
+  NUM_LOAD_RESULTS,
+};
+
+extern const char kLoadCohortHistogramName[];
+extern const char kLoadSecretHistogramName[];
+
+// Registers all rappor preferences.
+void RegisterPrefs(PrefRegistrySimple* registry);
+
+// Retrieves the cohort number this client was assigned to, generating it if
+// doesn't already exist. The cohort should be persistent.
+int32_t LoadCohort(PrefService* pref_service);
+
+// Retrieves the value for secret from preferences, generating it if doesn't
+// already exist. The secret should be persistent, so that additional bits
+// from the client do not get exposed over time.
+std::string LoadSecret(PrefService* pref_service);
+
+}  // namespace internal
+
+}  // namespace rappor
+
+#endif  // COMPONENTS_RAPPOR_RAPPOR_PREFS_H_