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

With a fix: actually set dry_run for presubmit, and don't set it for other builders.

R=machenbach@chromium.org,sergiyb@chromium.org
BUG=601128,594127,591030

Review-Url: https://codereview.chromium.org/1926663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300295 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -337,6 +337,8 @@ def trigger_try_jobs(auth_config, changelist, options, masters, category):
               '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 @@ def CMDtry(parser, args):
           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