Expose a low-end device mode override flags for non-android OSs as well

base/android/sys_utils_android.cc

+#include "base/android/sys_utils_android.h"
+
+#include "base/android/build_info.h"
+#include "base/lazy_instance.h"
+#include "base/sys_info_internal.h"
+#include "jni/SysUtils_jni.h"
+
+namespace base {
+namespace android {
+
+bool SysUtilsAndroid::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+bool SysUtilsAndroid::IsLowEndDeviceFromJni() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_SysUtils_isLowEndDevice(env);
+}
+}  // namespace android
+
+static base::LazyInstance<
+    base::internal::LazySysInfoValue<bool,
+        android::SysUtilsAndroid::IsLowEndDeviceFromJni> >::Leaky
+    g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER;
+
+bool SysUtils::IsLowEndDevice() {
+  return g_lazy_low_end_device.Get().value();
+}
+}  // namespace base
+