Add variations filtering for is_low_end_device.

components/variations/study_filtering.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_STUDY_FILTERING_H_
 #define COMPONENTS_VARIATIONS_STUDY_FILTERING_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 23 matching lines @@
 // |filter|.
 bool CheckStudyHardwareClass(const Study::Filter& filter,
                              const std::string& hardware_class);
 
 // Checks whether a study is applicable for the given |locale| per |filter|.
 bool CheckStudyLocale(const Study::Filter& filter, const std::string& locale);
 
 // Checks whether a study is applicable for the given |platform| per |filter|.
 bool CheckStudyPlatform(const Study::Filter& filter, Study::Platform platform);
 
+// Checks whether a study is applicable given |is_low_end_device| per |filter|.
+bool CheckStudyLowEndDevice(const Study::Filter& filter,
+                            bool is_low_end_device);
+
 // Checks whether a study is applicable for the given date/time per |filter|.
 bool CheckStudyStartDate(const Study::Filter& filter,
                          const base::Time& date_time);
 
 // Checks whether a study is applicable for the given date/time per |filter|.
 bool CheckStudyEndDate(const Study::Filter& filter,
                        const base::Time& date_time);
 
 // Checks whether a study is applicable for the given version per |filter|.
 bool CheckStudyVersion(const Study::Filter& filter,
@@ skipping 22 matching lines @@
 // validates and pre-processes them, adding any kept studies to the
 // |filtered_studies| list. Ensures that the resulting list will not have more
 // than one study with the same name.
 void FilterAndValidateStudies(const VariationsSeed& seed,
                               const ClientFilterableState& client_state,
                               std::vector<ProcessedStudy>* filtered_studies);
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_STUDY_FILTERING_H_