webauthn: use Bluetooth name in caBLEv2 linking.

BUG=1002262

Change-Id: Ic2ee06eab6944116e4139525967d9810cbf55893
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551742
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#829942}

chrome/android/features/cablev2_authenticator/java/src/org/chromium/chrome/browser/webauth/authenticator/CableAuthenticator.java

@@ -468,6 +468,10 @@ class CableAuthenticator {
     }
 
     static String getName() {
+        final String name = BluetoothAdapter.getDefaultAdapter().getName();
+        if (name != null && name.length() > 0) {
+            return name;
+        }
         return Build.MANUFACTURER + " " + Build.MODEL;
     }