Add option to specify similarity level for git diff operations on commandline

tests/git_cl_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Unit tests for git_cl.py."""
 
 import os
 import StringIO
 import stat
@@ skipping 97 matching lines @@
       ((['git', 'config', 'branch.master.remote'],), 'origin'),
       ((['git', 'rev-parse', '--show-cdup'],), ''),
       ((['git', 'rev-parse', 'HEAD'],), '12345'),
       ((['git', 'diff', '--name-status', '-r', 'master...', '.'],),
         'M\t.gitignore\n'),
       ((['git', 'config', 'branch.master.rietveldissue'],), ''),
       ((['git', 'config', 'branch.master.rietveldpatchset'],), ''),
       ((['git', 'log', '--pretty=format:%s%n%n%b', 'master...'],), 'foo'),
       ((['git', 'config', 'user.email'],), 'me@example.com'),
       ((['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-         '-l100000', 'master...'],),
+         '-C50', '-l100000', 'master...'],),
        '+dat'),
       ((['git', 'log', '--pretty=format:%s\n\n%b', 'master..'],), 'desc\n'),
     ]
 
   @staticmethod
   def _git_upload_calls():
     return [
       ((['git', 'config', 'rietveld.cc'],), ''),
       ((['git', 'config', 'branch.master.base-url'],), ''),
       ((['git', 'config', '--get-regexp', '^svn-remote\\.'],),
@@ skipping 57 matching lines @@
          'codereview.example.com'),
       (('GitClHooksBypassedCommit',
         'Issue https://codereview.example.com/12345 bypassed hook when '
         'committing'), None),
   ]
 
   @classmethod
   def _dcommit_calls_3(cls):
     return [
       ((['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-         '-l100000', 'refs/remotes/origin/master', 'refs/heads/working'],),
+         '-C50', '-l100000', 'refs/remotes/origin/master',
+         'refs/heads/working'],),
        (' PRESUBMIT.py |    2 +-\n'
         ' 1 files changed, 1 insertions(+), 1 deletions(-)\n')),
       (('About to commit; enter to confirm.',), None),
       ((['git', 'show-ref', '--quiet', '--verify',
          'refs/heads/git-cl-commit'],),
        (('', None), 0)),
       ((['git', 'branch', '-D', 'git-cl-commit'],), ''),
       ((['git', 'show-ref', '--quiet', '--verify',
          'refs/heads/git-cl-cherry-pick'],), ''),
       ((['git', 'rev-parse', '--show-cdup'],), '\n'),
       ((['git', 'checkout', '-q', '-b', 'git-cl-commit'],), ''),
       ((['git', 'reset', '--soft', 'refs/remotes/origin/master'],), ''),
       ((['git', 'commit', '-m',
          'Issue: 12345\n\nReview URL: https://codereview.example.com/12345'],),
        ''),
-      ((['git', 'svn', 'dcommit', '--no-rebase', '--rmdir'],), (('', None), 0)),
+      ((['git', 'svn', 'dcommit', '-C50', '--no-rebase', '--rmdir'],),
+       (('', None), 0)),
       ((['git', 'checkout', '-q', 'working'],), ''),
       ((['git', 'branch', '-D', 'git-cl-commit'],), ''),
   ]
 
   @staticmethod
   def _cmd_line(description, args):
     """Returns the upload command line passed to upload.RealMain()."""
     return [
         'upload', '--assume_yes', '--server',
         'https://codereview.example.com',
         '--message', description
     ] + args + [
         '--cc', 'joe@example.com',
+        '--git_similarity', '50',
         'master...'
     ]
 
   def _run_reviewer_test(
       self,
       upload_args,
       expected_description,
       returned_description,
       final_description,
       reviewers):
@@ skipping 111 matching lines @@
         ((['git', 'config', 'branch.master.remote'],), 'origin'),
         ((['git', 'rev-parse', '--show-cdup'],), ''),
         ((['git', 'rev-parse', 'HEAD'],), '12345'),
         ((['git', 'diff', '--name-status', '-r', 'master...', '.'],),
          'M\t.gitignore\n'),
         ((['git', 'config', 'branch.master.rietveldissue'],), ''),
         ((['git', 'config', 'branch.master.rietveldpatchset'],), ''),
         ((['git', 'log', '--pretty=format:%s%n%n%b', 'master...'],), 'foo'),
         ((['git', 'config', 'user.email'],), 'me@example.com'),
         ((['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-           '-l100000', 'master...'],),
+           '-C50', '-l100000', 'master...'],),
          '+dat'),
         ]
 
   @staticmethod
   def _gerrit_upload_calls(description, reviewers):
     calls = [
         ((['git', 'log', '--pretty=format:%s\n\n%b', 'master..'],),
          description),
         ((['git', 'config', 'rietveld.cc'],), '')
         ]
@@ skipping 90 matching lines @@
         ((['git', 'config', 'rietveld.viewvc-url'],), ''),
         (('ViewVC URL:',), ''),
         # DownloadHooks(True)
         ((commit_msg_path, os.X_OK,), True),
         ]
     git_cl.main(['config'])
 
 
 if __name__ == '__main__':
   unittest.main()