build_command_buffer: Don't 'git checkout' when --no-sync

tools/build_command_buffer.py

 #!/usr/bin/python
 
 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 """
 Script to build the command buffer shared library and copy it to Skia tree
@@ skipping 96 matching lines @@
     shared_lib_subdir = ''
     gclient = 'gclient.bat'
 
   if not args.no_sync:
     try:
       subprocess.check_call(['git', 'fetch'], cwd=chrome_src_dir)
     except subprocess.CalledProcessError as error:
       sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
           error.cmd, chrome_src_dir))
 
-  try:
-    subprocess.check_call(['git', 'checkout', args.chrome_revision],
-        cwd=chrome_src_dir)
-  except subprocess.CalledProcessError as error:
-    sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
-        error.cmd, chrome_src_dir))
+    try:
+      subprocess.check_call(['git', 'checkout', args.chrome_revision],
+          cwd=chrome_src_dir)
+    except subprocess.CalledProcessError as error:
+      sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+          error.cmd, chrome_src_dir))
 
-  if not args.no_sync:
     try:
       os.environ['GYP_GENERATORS'] = 'ninja'
       subprocess.check_call([gclient, 'sync', '--reset', '--force'],
           cwd=chrome_src_dir)
     except subprocess.CalledProcessError as error:
       sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
           error.cmd, chrome_src_dir))
 
   try:
     subprocess.check_call(['ninja'] + shlex.split(args.extra_ninja_args) +
@@ skipping 21 matching lines @@
 
   if not os.path.isfile(shared_lib_dst):
     sys.exit('Command buffer library not copied to ' + shared_lib_dst)
 
   print('Command buffer library copied to ' + shared_lib_dst)
 
 
 if __name__ == '__main__':
   main()