Add extra logging to roll_deps.py

This is to help debug a depot_tools auth problem and can be reverted
once it is solved.

Bug: skia:8394
Change-Id: I3c713fce6c6ba6edbd2498d95938b48a28eff588
Reviewed-on: https://webrtc-review.googlesource.com/101160
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Yves Gerey <yvesg@webrtc.org>
Commit-Queue: Eric Boren <borenet@google.com>
Cr-Commit-Position: refs/heads/master@{#24781}
diff --git a/tools_webrtc/autoroller/roll_deps.py b/tools_webrtc/autoroller/roll_deps.py
index 7ea93c4..d91d838 100755
--- a/tools_webrtc/autoroller/roll_deps.py
+++ b/tools_webrtc/autoroller/roll_deps.py
@@ -605,7 +605,13 @@
   elif commit_queue_mode >= 1:
     logging.info('Starting CQ dry run...')
     cmd.extend(['--cq-dry-run'])
-  _RunCommand(cmd, extra_env={'EDITOR': 'true', 'SKIP_GCE_AUTH_FOR_GIT': '1'})
+  extra_env = {
+      'EDITOR': 'true',
+      'SKIP_GCE_AUTH_FOR_GIT': '1',
+  }
+  stdout, stderr = _RunCommand(cmd, extra_env=extra_env)
+  logging.debug('Output from "git cl upload":\nstdout:\n%s\n\nstderr:\n%s',
+      stdout, stderr)
 
 
 def GetRollRevisionRanges(opts, webrtc_deps):