Force RevisionState.commit_hash to be a str.

scripts/slave/recipe_modules/auto_bisect/revision_state.py

 # Copyright 2015 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.
 
 """An interface for holding state and result of revisions in a bisect job.
 
 When implementing support for tests other than perf, one should extend this
 class so that the bisect module and recipe can use it.
 
 See perf_revision_state for an example.
@@ skipping 52 matching lines @@
     self.test_results_url = None
     self.build_archived = False
     self.status = RevisionState.NEW
     self.next_revision = None
     self.previous_revision = None
     self.job_name = None
     self.patch_file = None
     self.deps_revision = None
     self.depot_name = depot_name or self.bisector.base_depot
     self.depot = depot_config.DEPOT_DEPS_NAME[self.depot_name]
-    self.commit_hash = commit_hash
+    self.commit_hash = str(commit_hash)
     self._rev_str = None
     self.base_revision = base_revision
     if self.base_revision:
       assert self.base_revision.deps_file_contents
       self.needs_patch = True
       self.deps_patch, self.deps_file_contents = self.bisector.make_deps_patch(
           self.base_revision, self.base_revision.deps_file_contents,
           self.depot, self.commit_hash)
       self.deps_sha = hashlib.sha1(self.deps_patch).hexdigest()
       self.deps_sha_patch = self.bisector.make_deps_sha_file(self.deps_sha)
@@ skipping 429 matching lines @@
         key=lambda x: len(x.values))
     if (len(self.bisector.last_tested_revision.values) ==
         next_revision_to_test.values):
       self.bisector.last_tested_revision.retest()
     else:
       next_revision_to_test.retest()
 
   def __repr__(self):
     return ('RevisionState(rev=%s, values=%r, mean_value=%r, std_dev=%r)' % (
         self.revision_string(), self.values, self.mean_value, self.std_dev))