borealis: Add TODOs related to DLC features

Discussed with the DLC team, we're tracking these two FRs from
DLCservice, so ive added TODOs in the relevant parts of the code.

Bug: b/172284265, b/172279567
Change-Id: If46949016defd403f266d3fb766488089657e7af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515804
Auto-Submit: Nic Hollingum <hollingum@google.com>
Reviewed-by: Daniel Ng <danielng@google.com>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#823420}

chrome/browser/chromeos/borealis/borealis_installer_impl.cc

@@ -161,6 +161,8 @@ void BorealisInstallerImpl::OnDlcInstallationCompleted(
   // At this point, the Borealis DLC installation has failed.
   InstallationResult result = InstallationResult::kDlcUnknown;
 
+  // TODO(b/172284265): Handle the case where a device update is required before
+  // a DLC can be installed.
   if (install_result.error == dlcservice::kErrorInternal) {
     LOG(ERROR) << "Something went wrong internally with DlcService.";
     result = InstallationResult::kDlcInternal;

chrome/browser/chromeos/borealis/borealis_task.cc

@@ -22,6 +22,8 @@ MountDlc::~MountDlc() = default;
 
 void MountDlc::Run(BorealisContext* context,
                    CompletionStatusCallback callback) {
+  // TODO(b/172279567): Ensure the DLC is present before trying to install,
+  // otherwise we will silently download borealis here.
   chromeos::DlcserviceClient::Get()->Install(
       kBorealisDlcName,
       base::BindOnce(&MountDlc::OnMountDlc, weak_factory_.GetWeakPtr(), context,