Update from https://crrev.com/329939

base/sys_info.cc

Index: base/sys_info.cc
diff --git a/base/sys_info.cc b/base/sys_info.cc
index 72a9944b9729ac4e9e9443fb4a79045bde801cf0..8640dc14edcfc01e94c3123b3055a003bc9bc4a1 100644
--- a/base/sys_info.cc
+++ b/base/sys_info.cc
@@ -7,7 +7,9 @@
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
+#include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/sys_info_internal.h"
 #include "base/time/time.h"
 
@@ -34,6 +36,14 @@ static LazyInstance<
 
 // static
 bool SysInfo::IsLowEndDevice() {
+  const std::string group_name =
+      base::FieldTrialList::FindFullName("MemoryReduction");
+
+  // Low End Device Mode will be enabled if this client is assigned to
+  // one of those EnabledXXX groups.
+  if (StartsWithASCII(group_name, "Enabled", true))
+    return true;
+
   return g_lazy_low_end_device.Get().value();
 }
 #endif