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

base/sys_info_ios.mm

Index: base/sys_info_ios.mm
diff --git a/base/sys_info_ios.mm b/base/sys_info_ios.mm
index 48c7bd944841b1f215e44c0cff71a02c1dff54c4..8b1ffd4521192f0f9db7e9c2b3b6621a4e6d1838 100644
--- a/base/sys_info_ios.mm
+++ b/base/sys_info_ios.mm
@@ -6,6 +6,8 @@
 
 #import <UIKit/UIKit.h>
 #include <mach/mach.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
@@ -65,4 +67,13 @@ int64 SysInfo::AmountOfPhysicalMemory() {
   return static_cast<int64>(hostinfo.max_mem);
 }
 
+// static
+std::string SysInfo::CPUModelName() {
+  char name[256];
+  size_t len = arraysize(name);
+  if (sysctlbyname("machdep.cpu.brand_string", &name, &len, NULL, 0) == 0)
+    return name;
+  return std::string();
+}
+
 }  // namespace base