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

components/variations/variations_seed_processor.h

 // Copyright 2013 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_PROCESSOR_H_
 #define COMPONENTS_VARIATIONS_VARIATIONS_SEED_PROCESSOR_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 10 matching lines @@
 #include "components/variations/proto/study.pb.h"
 #include "components/variations/proto/variations_seed.pb.h"
 
 namespace base {
 class FeatureList;
 }
 
 namespace variations {
 
 class ProcessedStudy;
+struct ClientFilterableState;
 
 // Helper class to instantiate field trials from a variations seed.
 class VariationsSeedProcessor {
  public:
   typedef base::Callback<void(uint32_t, const base::string16&)>
       UIStringOverrideCallback;
 
   VariationsSeedProcessor();
   virtual ~VariationsSeedProcessor();
 
-  // Creates field trials from the specified variations |seed|, based on the
-  // specified configuration, as specified in the parameters. Any study that
-  // should use low entropy will use |low_entropy_provider| for group
-  // selection. These studies are defined by ShouldStudyUseLowEntropy;
+  // Creates field trials from the specified variations |seed|, filtered
+  // according to the client's |client_state|. Any study that should use low
+  // entropy will use |low_entropy_provider| for group selection. These studies
+  // are defined by ShouldStudyUseLowEntropy;
   void CreateTrialsFromSeed(
       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,
       const UIStringOverrideCallback& override_callback,
       const base::FieldTrial::EntropyProvider* low_entropy_provider,
       base::FeatureList* feature_list);
 
   // If the given |study| should alwoys use low entropy. This is true for any
   // study that can send data to other Google properties.
   static bool ShouldStudyUseLowEntropy(const Study& study);
 
  private:
   friend class VariationsSeedProcessorTest;
@@ skipping 28 matching lines @@
       const UIStringOverrideCallback& override_callback,
       const base::FieldTrial::EntropyProvider* low_entropy_provider,
       base::FeatureList* feature_list);
 
   DISALLOW_COPY_AND_ASSIGN(VariationsSeedProcessor);
 };
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_VARIATIONS_SEED_PROCESSOR_H_