add auto-update step to 'fetch' wrappers

R=iannucci@chromium.org

Review URL: https://codereview.chromium.org/13618002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@192233 0039d316-1c4b-4281-b951-d872f2087c98

fetch

@@ -5,4 +5,8 @@
 
 base_dir=$(dirname "$0")
 
+if [[ "#grep#fetch#cleanup#diff#" != *"#$1#"* ]]; then
+  "$base_dir"/update_depot_tools
+fi
+
 PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/fetch.py" "$@"

fetch.bat

@@ -6,5 +6,8 @@
 :: This is required with cygwin only.
 PATH=%~dp0;%PATH%
 
+:: Synchronize the root directory before deferring control back to gclient.py.
+call "%~dp0\update_depot_tools.bat"
+
 :: Defer control.
 %~dp0python "%~dp0\fetch.py" %*