Disable bot runs of horizontal class merging

We currently don't do anything based on this flag, so make it a noop
until somehting is passed to gradle

Change-Id: I9d745ace300ab3bfd5f7c9bf157d8b4f30d79f12
diff --git a/tools/test.py b/tools/test.py
index fbc1985..654ceaa 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -162,6 +162,12 @@
 def Main():
   (options, args) = ParseOptions()
 
+  if options.horizontal_class_merging:
+    # This flag is in preperation of running horizontal class merging
+    # but currently is the same as the default tests. Don't run to
+    # save resources on the bots.
+    return 0
+
   if utils.is_bot():
     gradle.RunGradle(['--no-daemon', 'clean'])