Revert of Delete unused code from systeminfo.

webrtc/base/systeminfo.h

+/*
+ *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_SYSTEMINFO_H__
+#define WEBRTC_BASE_SYSTEMINFO_H__
+
+#include <string>
+
+#include "webrtc/base/basictypes.h"
+
+namespace rtc {
+
+class SystemInfo {
+ public:
+  enum Architecture {
+    SI_ARCH_UNKNOWN = -1,
+    SI_ARCH_X86 = 0,
+    SI_ARCH_X64 = 1,
+    SI_ARCH_ARM = 2
+  };
+
+  SystemInfo();
+
+  // The number of CPU Threads in the system.
+  static int GetMaxCpus();
+  // The number of CPU Threads currently available to this process.
+  static int GetCurCpus();
+  // Identity of the CPUs.
+  Architecture GetCpuArchitecture();
+  std::string GetCpuVendor();
+  // Total amount of physical memory, in bytes.
+  int64_t GetMemorySize();
+  // The model name of the machine, e.g. "MacBookAir1,1"
+  std::string GetMachineModel();
+
+ private:
+  static int logical_cpus_;
+};
+
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_SYSTEMINFO_H__