Support pub --with-prejudice.

sdk/lib/_internal/pub/lib/src/progress.dart

Index: sdk/lib/_internal/pub/lib/src/progress.dart
diff --git a/sdk/lib/_internal/pub/lib/src/progress.dart b/sdk/lib/_internal/pub/lib/src/progress.dart
index ad1ceb2582e54647ace864deca5fef59f5c76e93..6c0ffdcf2f2dc3d8330991cf503082ad49702692 100644
--- a/sdk/lib/_internal/pub/lib/src/progress.dart
+++ b/sdk/lib/_internal/pub/lib/src/progress.dart
@@ -81,14 +81,14 @@ class Progress {
 
     // Print a final message without a time indicator so that we don't leave a
     // misleading half-complete time indicator on the console.
-    stdout.writeln("\r$_message...");
+    stdout.writeln(log.format("\r$_message..."));
     _timer.cancel();
     _timer = null;
   }
 
   /// Refreshes the progress line.
   void _update() {
-    stdout.write("\r$_message... ");
+    stdout.write(log.format("\r$_message... "));
 
     // Show the time only once it gets noticeably long.
     if (_stopwatch.elapsed.inSeconds > 0) {