Refine systemInfo.cpu API defintions and provide systemInfo.cpu.get impl for Windows and Linux

base/sys_info_mac.cc

Index: base/sys_info_mac.cc
diff --git a/base/sys_info_mac.cc b/base/sys_info_mac.cc
index 1a1d23c236f6856ebb55157a0dcd56706ca4d6ef..e47d52908d12260d00c144551fa5d4104cdb0b76 100644
--- a/base/sys_info_mac.cc
+++ b/base/sys_info_mac.cc
@@ -54,4 +54,10 @@ int64 SysInfo::AmountOfPhysicalMemory() {
   return static_cast<int64>(hostinfo.max_mem);
 }
 
+// static
+std::string SysInfo::CPUModelName() {
+  // TODO(hongbo): Retrive cpu model name.

[Mark Mentovai, 2012/09/06 13:39:13]

The machdep.cpu.brand_string sysctl is equivalent to the “model name” field in
Linux’ /proc/cpuinfo.

[Hongbo Min, 2012/09/06 14:09:09]

Thanks for you hints. The impl is uploaded.

+  return "unknown";
+}
+
 }  // namespace base