geckodriver: Print the binary args when starting the browser

Source-Repo: https://github.com/mozilla/geckodriver
Source-Revision: 1c8b27a4379a92f56b6d11d889a636424e9852b8

committer: Andreas Tolfsen <ato@mozilla.com>

--HG--
extra : rebase_source : b39097aabcf03030111006c4d3b1398456639458

testing/geckodriver/src/marionette.rs

@@ -310,7 +310,7 @@ impl MarionetteHandler {
                                     format!("Failed to set preferences: {}", e))
             }));
 
-        info!("Starting browser {}", binary.display());
+        info!("Starting browser {} with args {:?}", binary.display(), runner.args());
         try!(runner.start()
             .map_err(|e| {
                 WebDriverError::new(ErrorStatus::SessionNotCreated,