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

components/variations/variations_seed_simulator.h

 // Copyright 2014 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_VARIATIONS_SEED_SIMULATOR_H_
 #define COMPONENTS_VARIATIONS_VARIATIONS_SEED_SIMULATOR_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/version.h"
 #include "components/variations/proto/study.pb.h"
 #include "components/variations/proto/variations_seed.pb.h"
 
 namespace variations {
 
 class ProcessedStudy;
+struct ClientFilterableState;
 class VariationsSeed;
 
 // VariationsSeedSimulator simulates the result of creating a set of studies
 // and detecting which studies would result in group changes.
 class VariationsSeedSimulator {
  public:
   // The result of variations seed simulation, counting the number of experiment
   // group changes of each type that are expected to occur on a restart with the
   // seed.
   struct Result {
@@ skipping 21 matching lines @@
   VariationsSeedSimulator(
       const base::FieldTrial::EntropyProvider& default_entropy_provider,
       const base::FieldTrial::EntropyProvider& low_entropy_provider);
   virtual ~VariationsSeedSimulator();
 
   // Computes differences between the current process' field trial state and
   // the result of evaluating |seed| with the given parameters. Returns the
   // results of the simulation as a set of expected group change counts of each
   // type.
   Result SimulateSeedStudies(const VariationsSeed& seed,
-                             const std::string& locale,
-                             const base::Time& reference_date,
-                             const base::Version& version,
-                             Study_Channel channel,
-                             Study_FormFactor form_factor,
-                             const std::string& hardware_class,
-                             const std::string& session_consistency_country,
-                             const std::string& permanent_consistency_country);
+                             const ClientFilterableState& client_state);
 
  private:
   friend class VariationsSeedSimulatorTest;
 
   enum ChangeType {
     NO_CHANGE,
     CHANGED,
     CHANGED_KILL_BEST_EFFORT,
     CHANGED_KILL_CRITICAL,
   };
@@ skipping 24 matching lines @@
 
   const base::FieldTrial::EntropyProvider& default_entropy_provider_;
   const base::FieldTrial::EntropyProvider& low_entropy_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(VariationsSeedSimulator);
 };
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_VARIATIONS_SEED_SIMULATOR_H_