[node] reset node checkout on v8 update

This is a temporary measure to get bots back in order.

Bug: chromium:860430

TBR=machenbach@chromium.org

Change-Id: I3275150f4bc5dfe8ab90984e15f8a1a469d70caf
Reviewed-on: https://chromium-review.googlesource.com/1127166Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54269}

tools/node/update_node.py

@@ -81,6 +81,12 @@ def CommitPatch(options):
       cwd=options.v8_path,
   )
 
+def ResetTarget(path):
+  """Temporarily use this to clear the checkout on the bots"""
+  print ">> Resetting Node.js checkout"
+  subprocess.check_call(["git", "reset", "--hard"], cwd=path)
+  subprocess.check_call(["git", "clean", "-fxd"], cwd=path)
+
 def UpdateTarget(repository, options, files_to_keep):
   source = os.path.join(options.v8_path, *repository)
   target = os.path.join(options.node_path, TARGET_SUBDIR, *repository)
@@ -168,6 +174,7 @@ def Main(args):
   if options.gclient:
     RunGclient(options.v8_path)
   # Commit patch on trybots to main V8 repository.
+  ResetTarget(options.node_path)
   if options.with_patch:
     CommitPatch(options)
   # Update main V8 repository.