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

base/sys_info_linux.cc

 // Copyright (c) 2011 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 <limits>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 28 matching lines @@
       DCHECK(static_cast<uint64>(limit) <= std::numeric_limits<size_t>::max());
       limit_valid = true;
     } else {
       NOTREACHED();
       return 0;
     }
   }
   return static_cast<size_t>(limit);
 }
 
+// static
+std::string SysInfo::CPUModelName() {
+  const char kModelNamePrefix[] = "model name";
+  std::string contents;
+  file_util::ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
+  DCHECK(!contents.empty());
+  if (!contents.empty()) {
+    std::istringstream iss(contents);
+    std::string line;
+    while (std::getline(iss, line)){
+      if (line.compare(0, strlen(kModelNamePrefix), kModelNamePrefix) == 0) {
+        size_t pos = line.find(": ");
+        return line.substr(pos + 2);
+      }
+    }
+  }
+
+  return "unknown";
+}
+
 }  // namespace base