Fix options in push-to-trunk script.

tools/push-to-trunk/push_to_trunk.py

Index: tools/push-to-trunk/push_to_trunk.py
diff --git a/tools/push-to-trunk/push_to_trunk.py b/tools/push-to-trunk/push_to_trunk.py
index c1b52e6ff4765165c62cfc498c805acf7a748d9b..24d9b7730ed2af216bac6db0fc2e6bf88764272f 100755
--- a/tools/push-to-trunk/push_to_trunk.py
+++ b/tools/push-to-trunk/push_to_trunk.py
@@ -68,6 +68,7 @@ class PushToTrunkOptions(CommonOptions):
     options.f = True
     options.m = False
     options.c = chrome_path
+    options.reviewer = reviewer
     options.a = author
     return PushToTrunkOptions(options)
 
@@ -82,6 +83,7 @@ class PushToTrunkOptions(CommonOptions):
     self.b = getattr(options, 'b', None)
     self.author = getattr(options, 'a', None)
 
+
 class Preparation(Step):
   MESSAGE = "Preparation."