[Variations] Refactor all state used for study filtering into a container struct.

components/variations/client_filterable_state.h

+// 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_VARIATIONS_CLIENT_FILTERABLE_STATE_H_
+#define COMPONENTS_VARIATIONS_CLIENT_FILTERABLE_STATE_H_
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "base/version.h"
+#include "components/variations/proto/study.pb.h"
+
+namespace variations {
+
+// A contianer for all of the client state which is used for filtering studies.
+struct ClientFilterableState {
+  static Study::Platform GetCurrentPlatform();
+
+  ClientFilterableState();
+  ~ClientFilterableState();
+
+  // The system locale.
+  std::string locale;
+
+  // The date on which the variations seed was fetched.
+  base::Time reference_date;
+
+  // The Chrome version to filter on.
+  base::Version version;
+
+  // The Channel for this Chrome installation.
+  Study::Channel channel;
+
+  // The hardware form factor that Chrome is running on.
+  Study::FormFactor form_factor;
+
+  // The OS on which Chrome is running.
+  Study::Platform platform;
+
+  // The named hardware configuration that Chrome is running on -- used to
+  // identify models of devices.
+  std::string hardware_class;
+
+  // The country code to use for studies configured with session consistency.
+  std::string session_consistency_country;
+
+  // The country code to use for studies configured with permanent consistency.
+  std::string permanent_consistency_country;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ClientFilterableState);
+};
+
+}  // namespace variations
+
+#endif  // COMPONENTS_VARIATIONS_CLIENT_FILTERABLE_STATE_H_