Add warnings to SVN update_depot_tools

update_depot_tools

 #!/usr/bin/env bash
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script will try to sync the bootstrap directories and then defer control.
 
 if [ "$USER" == "root" ];
 then
   echo Running depot tools as root is sad.
@@ skipping 142 matching lines @@
 if [ "X$DEPOT_TOOLS_UPDATE" != "X0" -a -e "$base_dir/.git" ]
 then
   cd $base_dir
   update_git_repo
   cd - > /dev/null
 fi
 
 # We're on POSIX. We can now safely look for svn checkout.
 if [ "X$DEPOT_TOOLS_UPDATE" != "X0" -a -e "$base_dir/.svn" ]
 then
+  echo "========================"
+  echo "WARNING: You have an SVN checkout of depot_tools!"
+  echo
+  echo "depot_tools is migrating to Git on June 6, 2016. If you still have an"
+  echo "SVN checkout then, you will STOP RECEIVING UPDATES to depot_tools."
+  echo
+  echo "Before that date, please follow the instructions here[1] to get a Git"
+  echo "copy of depot_tools."
+  echo
+  echo "[1]: https://www.chromium.org/developers/how-tos/install-depot-tools"
+  echo "========================"
   # Update the root directory to stay up-to-date with the latest depot_tools.
   BEFORE_REVISION=$(get_svn_revision)
   if echo $* | grep -e --force > /dev/null; then
     "$SVN" -q revert -R "$base_dir"
   fi
   "$SVN" -q up "$base_dir"
   AFTER_REVISION=$(get_svn_revision)
   if [[ "$BEFORE_REVISION" != "$AFTER_REVISION" ]]; then
     if [ -z "$DEPOT_TOOLS_HIDE_UPDATED_MESSAGE" ]; then
       echo "Depot Tools has been updated to revision $AFTER_REVISION." 1>&2
     fi
   fi
 fi
 
 find "$base_dir" -iname "*.pyc" -exec rm -f {} \;