code:
string16 TaskManagerModel::GetResourceCPUUsage(int index) const {
  CHECK_LT(index, ResourceCount());

  std::string foo = UTF16ToUTF8(WideToUTF16Hack(StringPrintf(L"%.0f", GetCPUUsage(resources_[index]))));
  printf("%s: [%.0f], [%s]\n", __PRETTY_FUNCTION__, GetCPUUsage(resources_[index]), foo.c_str());

  return WideToUTF16Hack(StringPrintf(
#if defined(OS_MACOSX)
      // Activity Monitor shows %cpu with one decimal digit -- be
      // consistent with that.
      L"%.1f",
#else
      L"%.0f",
#endif
      GetCPUUsage(resources_[index])));
}

result:
string16 TaskManagerModel::GetResourceCPUUsage(int) const: [3], []