Move system.* family of APIs to extensions/

chrome/browser/extensions/api/system_cpu/cpu_info_provider_linux.cc

-// Copyright 2014 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 "chrome/browser/extensions/api/system_cpu/cpu_info_provider.h"
-
-#include <cstdio>
-#include <sstream>
-
-#include "base/file_util.h"
-#include "base/format_macros.h"
-
-namespace extensions {
-
-namespace {
-
-const char kProcStat[] = "/proc/stat";
-
-}  // namespace
-
-bool CpuInfoProvider::QueryCpuTimePerProcessor(
-    std::vector<linked_ptr<api::system_cpu::ProcessorInfo> >* infos) {
-  DCHECK(infos);
-
-  std::string contents;
-  if (!base::ReadFileToString(base::FilePath(kProcStat), &contents))
-     return false;
-
-  std::istringstream iss(contents);
-  std::string line;
-
-  // Skip the first line because it is just an aggregated number of
-  // all cpuN lines.
-  std::getline(iss, line);
-  size_t i = 0;
-  while (std::getline(iss, line)) {
-    if (line.compare(0, 3, "cpu") != 0)
-      continue;
-
-    uint64 user = 0, nice = 0, sys = 0, idle = 0;
-    int vals = sscanf(line.c_str(), "%*s %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64,
-           &user, &nice, &sys, &idle);
-    DCHECK_EQ(4, vals);
-
-    DCHECK(i < infos->size());
-    infos->at(i)->usage.kernel = static_cast<double>(sys);
-    infos->at(i)->usage.user = static_cast<double>(user + nice);
-    infos->at(i)->usage.idle = static_cast<double>(idle);
-    infos->at(i)->usage.total = static_cast<double>(sys + user + nice + idle);
-    ++i;
-  }
-  DCHECK_EQ(infos->size(), i);
-  return true;
-}
-
-}  // namespace extensions