Add a --json option to git cl try-results.

tests/git_cl_test.py

Index: tests/git_cl_test.py
diff --git a/tests/git_cl_test.py b/tests/git_cl_test.py
index 47eaaf7eb32b919d583dcfa1c98709f5f6ac1531..d473516569611d7a782b953cdcf6e08f7afceee4 100755
--- a/tests/git_cl_test.py
+++ b/tests/git_cl_test.py
@@ -1850,6 +1850,26 @@ class TestGitCl(TestCase):
         out.getvalue(),
         'scheduled CQ Dry Run on https://codereview.chromium.org/123\n')
 
+  def test_git_cl_try_results_json(self):
+    # out =
+    # self.mock(git_cl.sys, 'stdout', out)
+    self.mock(git_cl.Changelist, 'GetMostRecentPatchset', lambda *_: 1)
+    self.calls = [
+        ((['git', 'symbolic-ref', 'HEAD'],), 'refs/heads/my-branch'),
+        ((['git', 'config', 'branch.my-branch.rietveldissue'],), '123'),
+        ((['git', 'config', 'rietveld.autoupdate'],), ''),
+        ((['git', 'config', 'rietveld.server'],),
+           'https://codereview.chromium.org'),
+        ((['git', 'config', 'branch.my-branch.rietveldpatchset'],), '1'),
+        ((['git', 'config', 'branch.my-branch.merge'],), 'feature'),
+        ((['git', 'config', 'branch.my-branch.remote'],), 'origin'),
+        (('write_json',
+          'output.json',
+          {'issue': 123,
+           'issue_url': 'https://codereview.chromium.org/123'}), '')
+    ]
+    pass

[iannucci, 2016/08/26 18:21:13]

this test doesn't look like it tests anything? It would be great if we could see
an example of the output JSON in this test.

[qyearsley, 2016/08/26 18:32:13]

Yeah, the test isn't written properly yet, I uploaded a patch before it was
finished :-/

+
   def _common_GerritCommitMsgHookCheck(self):
     self.mock(git_cl.sys, 'stdout', StringIO.StringIO())
     self.mock(git_cl.os.path, 'abspath',