device/fido: log unexpected U2F status values.

These values get translated into a generic "other" error, so it's
useful to see what the underlying code was.

Change-Id: I320b41f82efe6a2b2a168d4b1ee87f5a01c2acf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626731
Auto-Submit: Adam Langley <agl@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#662547}

device/fido/u2f_register_operation.cc

@@ -110,6 +110,8 @@ void U2fRegisterOperation::OnCheckForExcludedKeyHandle(
 
     default:
       // Some sort of failure occurred. Silently drop device request.
+      FIDO_LOG(ERROR) << "Unexpected status " << static_cast<int>(result)
+                      << " from U2F device";
       std::move(callback())
           .Run(CtapDeviceResponseCode::kCtap2ErrOther, base::nullopt);
       break;
@@ -165,6 +167,8 @@ void U2fRegisterOperation::OnRegisterResponseReceived(
 
     default:
       // An error has occurred, quit trying this device.
+      FIDO_LOG(ERROR) << "Unexpected status " << static_cast<int>(result)
+                      << " from U2F device";
       std::move(callback())
           .Run(CtapDeviceResponseCode::kCtap2ErrOther, base::nullopt);
       break;