Add variations filtering for is_low_end_device.

components/variations/study_filtering.cc

Index: components/variations/study_filtering.cc
diff --git a/components/variations/study_filtering.cc b/components/variations/study_filtering.cc
index e7ccd25888f272b6ad9d4946c33943e3b2c243ff..97d43905d8b8649549f78c0af04a394755359823 100644
--- a/components/variations/study_filtering.cc
+++ b/components/variations/study_filtering.cc
@@ -116,6 +116,12 @@ bool CheckStudyPlatform(const Study::Filter& filter, Study::Platform platform) {
   return false;
 }
 
+bool CheckStudyLowEndDevice(const Study::Filter& filter,
+                            bool is_low_end_device) {
+  return !filter.has_is_low_end_device() ||
+         filter.is_low_end_device() == is_low_end_device;
+}
+
 bool CheckStudyStartDate(const Study::Filter& filter,
                          const base::Time& date_time) {
   if (filter.has_start_date()) {
@@ -245,6 +251,13 @@ bool ShouldAddStudy(const Study& study,
       return false;
     }
 
+    if (!CheckStudyLowEndDevice(study.filter(),
+                                client_state.is_low_end_device)) {
+      DVLOG(1) << "Filtered out study " << study.name()
+               << " due to is_low_end_device.";
+      return false;
+    }
+
     const std::string& country = GetClientCountryForStudy(study, client_state);
     if (!CheckStudyCountry(study.filter(), country)) {
       DVLOG(1) << "Filtered out study " << study.name() << " due to country.";