Merge "Improve logging in bootstat."

  // Shift last_reboot_reason_property to last_last_reboot_reason_property

  std::string last_boot_reason;

  if (!android::base::ReadFileToString(last_reboot_reason_file, &last_boot_reason)) {

    PLOG(ERROR) << "Failed to read " << last_reboot_reason_file;

    last_boot_reason = android::base::GetProperty(last_reboot_reason_property, "");

    LOG(INFO) << "Value of " << last_reboot_reason_property << " : " << last_boot_reason;

  } else {

    LOG(INFO) << "Last reboot reason read from " << last_reboot_reason_file << " : "

              << last_boot_reason << ". Last reboot reason read from "

              << last_reboot_reason_property << " : "

              << android::base::GetProperty(last_reboot_reason_property, "");

  }

  if (last_boot_reason.empty() || isKernelRebootReason(system_boot_reason)) {

    last_boot_reason = system_boot_reason;

  } else {

    transformReason(last_boot_reason);

  }

  LOG(INFO) << "Normalized last reboot reason : " << last_boot_reason;

  android::base::SetProperty(last_last_reboot_reason_property, last_boot_reason);

  android::base::SetProperty(last_reboot_reason_property, "");

  unlink(last_reboot_reason_file);

  if (unlink(last_reboot_reason_file) != 0) {

    PLOG(ERROR) << "Failed to unlink " << last_reboot_reason_file;

  }

}

// Gets the boot time offset. This is useful when Android is running in a