Add variations filtering for is_low_end_device.

components/variations/client_filterable_state.h

Index: components/variations/client_filterable_state.h
diff --git a/components/variations/client_filterable_state.h b/components/variations/client_filterable_state.h
index c2671f37da31e0bab649adeb8fd83f78334b6aec..20ebaa984769390b778de9d0ffb302e6ddfd6f5e 100644
--- a/components/variations/client_filterable_state.h
+++ b/components/variations/client_filterable_state.h
@@ -41,6 +41,10 @@ struct ClientFilterableState {
   // identify models of devices.
   std::string hardware_class;
 
+  // Whether this is a low-end device. Currently only supported on Android.
+  // Based on base::SysInfo::IsLowEndDevice().
+  bool is_low_end_device = false;
+
   // The country code to use for studies configured with session consistency.
   std::string session_consistency_country;