Fixes for CommandBuffer bot

tools/build_command_buffer.py

Index: tools/build_command_buffer.py
diff --git a/tools/build_command_buffer.py b/tools/build_command_buffer.py
index e57f4960c5cca0c2e97e68cbdb487b39fea8c295..88748d678921885d923f4ef3b4725ccb1c3fc000 100755
--- a/tools/build_command_buffer.py
+++ b/tools/build_command_buffer.py
@@ -111,15 +111,15 @@ def main():
     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)
+      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)
+    sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+        error.cmd, chrome_src_dir))
 
   if not args.no_sync:
     try:
@@ -127,16 +127,16 @@ def main():
       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)
+      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) +
         ['-C', chrome_target_dir_rel, 'command_buffer_gles2'],
         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)
+    sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+        error.cmd, chrome_src_dir))
 
   shared_lib_src_dir = os.path.join(chrome_src_dir, chrome_target_dir_rel,
                                     shared_lib_subdir)