[TTS] Add aggregation of CTR metrics to the CS component.

components/contextual_search/browser/native_int_storage.h

+// Copyright 2016 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_CONTEXTUAL_SEARCH_BROWSER_NATIVE_INT_STORAGE_H_
+#define COMPONENTS_CONTEXTUAL_SEARCH_BROWSER_NATIVE_INT_STORAGE_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+namespace contextual_search {
+
+class NativeIntStorage {

[Theresa, 2016/08/26 23:32:08]

I think DeviceIntStorage does make more sense or PersistentIntStorage or
something like that.

Also, this class could use a description.

[Donn Denman, 2016/08/29 22:58:06]

Done.

+ public:
+  NativeIntStorage() {}
+  virtual ~NativeIntStorage() {}
+
+  virtual int ReadInt(std::string storage_key) = 0;
+  virtual void WriteInt(std::string storage_key, int value) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativeIntStorage);
+};
+
+}  // namespace contextual_search
+
+#endif  // COMPONENTS_CONTEXTUAL_SEARCH_BROWSER_NATIVE_INT_STORAGE_H_