Respect CHROME_USER_DATA_DIR in start-up scripts.

This change allows CHROME_USER_DATA_DIR to override the default profile location
is Chrome is launched via a start-up script. The behaviour is unchanged if that
environment variable is not set.

BUG=351002

Review URL: https://codereview.chromium.org/190473005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260461 0039d316-1c4b-4281-b951-d872f2087c98

chrome/installer/linux/common/wrapper

@@ -48,5 +48,12 @@ if [[ -n "@@SXS_USER_DATA_DIR@@" ]]; then
   fi
 fi
 
+# Make sure that the profile directory specified in the environment, if any,
+# overrides the default.
+if [[ -n "$CHROME_USER_DATA_DIR" ]]; then
+  PROFILE_DIRECTORY_FLAG="--user-data-dir=$CHROME_USER_DATA_DIR"
+fi
+
 # Note: exec -a below is a bashism.
-exec -a "$0" "$HERE/@@PROGNAME@@" @@DEFAULT_FLAGS@@ "$@"
+exec -a "$0" "$HERE/@@PROGNAME@@" @@DEFAULT_FLAGS@@ "$PROFILE_DIRECTORY_FLAG" \
+  "$@"