Fix tree check in merge-to-branch script.

tools/merge-to-branch.sh

 #!/bin/bash
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 225 matching lines @@
 
 upload_step
 
 let CURRENT_STEP+=1
 if [ $START_STEP -le $CURRENT_STEP ] ; then
   echo ">>> Step $CURRENT_STEP: Commit to the repository."
   restore_if_unset "MERGE_TO_BRANCH"
   git checkout $BRANCHNAME \
     || die "cannot ensure that the current branch is $BRANCHNAME"
   wait_for_lgtm
-  PRESUBMIT_TREE_CHECK="skip" git cl dcommit \
+  PRESUBMIT_TREE_CHECK="skip" git cl presubmit \
+    || die "presubmit failed"
+  PRESUBMIT_TREE_CHECK="skip" git cl dcommit --bypass-hooks \
     || die "failed to commit to $MERGE_TO_BRANCH"
 fi
 
 let CURRENT_STEP+=1
 if [ $START_STEP -le $CURRENT_STEP ] && [ $REVERT_FROM_BLEEDING_EDGE -eq 0 ] ; then
   echo ">>> Step $CURRENT_STEP: Determine svn commit revision"
   restore_if_unset "NEW_COMMIT_MSG"
   restore_if_unset "MERGE_TO_BRANCH"
   git svn fetch || die "'git svn fetch' failed."
   COMMIT_HASH=$(git log -1 --format=%H --grep="$NEW_COMMIT_MSG" \
@@ skipping 31 matching lines @@
   restore_version_if_unset "NEW"
   common_cleanup
   if [ $REVERT_FROM_BLEEDING_EDGE==0 ] ; then
     echo "*** SUMMARY ***"
     echo "version: $NEWMAJOR.$NEWMINOR.$NEWBUILD.$NEWPATCH"
     echo "branch: $TO_URL"
     echo "svn revision: $SVN_REVISION"
     [[ -n "$REVISION_LIST" ]] && echo "patches:$REVISION_LIST"
   fi
 fi