Don't track SCM changes in rebaseline commands.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py
index 76392e28977c282e3377fb97d2db441b18dfbd0a..2bc3946ba9faccb29a47a6b065937de4bc9ab748 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py
@@ -31,6 +31,10 @@ from webkitpy.common.system.executive_mock import MockExecutive
 
 
 class MockSCM(object):
+
+    # Arguments are generally unused in methods that return canned values below.
+    # pylint: disable=unused-argument
+
     executable_name = "MockSCM"
 
     def __init__(self, filesystem=None, executive=None):
@@ -40,6 +44,12 @@ class MockSCM(object):
         self._executive = executive or MockExecutive()
         self._local_commits = []
 
+    def add_all(self, pathspec=None):
+        if not pathspec:
+            pathspec = self.checkout_root
+        for path in self._filesystem.glob(pathspec):
+            self.add_list(self._filesystem.files_under(path))
+
     def add(self, destination_path, return_exit_code=False):
         self.add_list([destination_path], return_exit_code)
 
@@ -48,7 +58,7 @@ class MockSCM(object):
         if return_exit_code:
             return 0
 
-    def has_working_directory_changes(self):
+    def has_working_directory_changes(self, pathspec=None):
         return False
 
     def ensure_cleanly_tracking_remote_master(self):