Move system.* family of APIs to extensions/

chrome/browser/extensions/api/system_cpu/cpu_info_provider_win.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 <windows.h>
-#include <winternl.h>
-
-#include "base/sys_info.h"
-
-namespace extensions {
-
-namespace {
-
-const wchar_t kNtdll[] = L"ntdll.dll";
-const char kNtQuerySystemInformationName[] = "NtQuerySystemInformation";
-
-// See MSDN about NtQuerySystemInformation definition.
-typedef DWORD (WINAPI *NtQuerySystemInformationPF)(DWORD system_info_class,
-                                                   PVOID system_info,
-                                                   ULONG system_info_length,
-                                                   PULONG return_length);
-
-}  // namespace
-
-bool CpuInfoProvider::QueryCpuTimePerProcessor(
-    std::vector<linked_ptr<api::system_cpu::ProcessorInfo> >* infos) {
-  DCHECK(infos);
-
-  HMODULE ntdll = GetModuleHandle(kNtdll);
-  CHECK(ntdll != NULL);
-  NtQuerySystemInformationPF NtQuerySystemInformation =
-      reinterpret_cast<NtQuerySystemInformationPF>(
-          ::GetProcAddress(ntdll, kNtQuerySystemInformationName));
-
-  CHECK(NtQuerySystemInformation != NULL);
-
-  int num_of_processors = base::SysInfo::NumberOfProcessors();
-  scoped_ptr<SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[]> processor_info(
-      new SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[num_of_processors]);
-
-  ULONG returned_bytes = 0, bytes =
-      sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION) * num_of_processors;
-  if (!NT_SUCCESS(NtQuerySystemInformation(
-          SystemProcessorPerformanceInformation,
-          processor_info.get(), bytes, &returned_bytes)))
-    return false;
-
-  int returned_num_of_processors =
-      returned_bytes / sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION);
-
-  if (returned_num_of_processors != num_of_processors)
-    return false;
-
-  DCHECK_EQ(num_of_processors, static_cast<int>(infos->size()));
-  for (int i = 0; i < returned_num_of_processors; ++i) {
-    double kernel = static_cast<double>(processor_info[i].KernelTime.QuadPart),
-        user = static_cast<double>(processor_info[i].UserTime.QuadPart),
-        idle = static_cast<double>(processor_info[i].IdleTime.QuadPart);
-
-    // KernelTime needs to be fixed-up, because it includes both idle time and
-    // real kernel time.
-    infos->at(i)->usage.kernel = kernel - idle;
-    infos->at(i)->usage.user = user;
-    infos->at(i)->usage.idle = idle;
-    infos->at(i)->usage.total = kernel + user;
-  }
-
-  return true;
-}
-
-}  // namespace extensions