Reland of git cl try: don't skip presubmit builders, but set dry_run property.

git_cl.py

Index: git_cl.py
diff --git a/git_cl.py b/git_cl.py
index 0acb9cd59ba2f67a73dc357a21e5ef0d2f851b14..fd2dcea4189f99632da41dafc2874c857f599091 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -337,6 +337,8 @@
               'rietveld': rietveld_url,
           },
       }
+      if 'presubmit' in builder.lower():
+        parameters['properties']['dry_run'] = 'true'
       if tests:
         parameters['properties']['testfilter'] = tests
       if properties:
@@ -4316,8 +4318,7 @@
           for master, builders in cq_masters.iteritems():
             for builder in builders:
               # Skip presubmit builders, because these will fail without LGTM.
-              if 'presubmit' not in builder.lower():
-                masters.setdefault(master, {})[builder] = ['defaulttests']
+              masters.setdefault(master, {})[builder] = ['defaulttests']
           if masters:
             return masters