Expose the list of remapped channels from LogReader

This helps us track more reliably which channels are remapped and which
aren't for any applications which automatically find channels.

Change-Id: Iae344bc613f53e15afac7a33d5c766defcb09ee6
Signed-off-by: Austin Schuh <austin.schuh@bluerivertech.com>
diff --git a/aos/events/logging/log_reader.h b/aos/events/logging/log_reader.h
index 8293956..5dfaeea 100644
--- a/aos/events/logging/log_reader.h
+++ b/aos/events/logging/log_reader.h
@@ -173,6 +173,9 @@
     return channel->logger() != LoggerConfig::NOT_LOGGED;
   }
 
+  // Returns a list of all the original channels from remapping.
+  std::vector<const Channel *> RemappedChannels() const;
+
   SimulatedEventLoopFactory *event_loop_factory() {
     return event_loop_factory_;
   }