fuchsia: Implement SysInfo::AmountOfPhysicalMemory and NumberOfProcessors

base/sys_info_fuchsia.cc

+// Copyright 2017 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.
+
+#include "base/sys_info.h"
+
+#include <magenta/syscalls.h>
+
+namespace base {
+
+// static
+int64_t SysInfo::AmountOfPhysicalMemory() {
+  return mx_system_get_physmem();
+}
+
+// static
+int SysInfo::NumberOfProcessors() {
+  return mx_system_get_num_cpus();
+}
+
+}  // namespace base