Add back ListChangesOption.DRAFT_COMMENTS

Change I297fcf01 removed the DRAFT_COMMENTS option because it is not
needed anymore, but now clients that still request this option do
fail. For backwards compatibility accept the DRAFT_COMMENTS option
even so it does nothing.

Change-Id: Ia89a094bd08f77a14d9be9381aaf11070e7b53e0
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/client/ListChangesOption.java b/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/client/ListChangesOption.java
index 7e99d1a..4c336f7 100644
--- a/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/client/ListChangesOption.java
+++ b/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/client/ListChangesOption.java
@@ -46,6 +46,10 @@
   /** Set the reviewed boolean for the caller. */
   REVIEWED(11),
 
+  /** Not used anymore, kept for backward compatibility */
+  @Deprecated
+  DRAFT_COMMENTS(12),
+
   /** Include download commands for the caller. */
   DOWNLOAD_COMMANDS(13),