Refactor infra git libs and testing.

infra/libs/git2/data/__init__.py

Index: infra/libs/git2/data/__init__.py
diff --git a/infra/libs/git2/data/__init__.py b/infra/libs/git2/data/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..d273b59b712807e698657e090d45db5565dd927d
--- /dev/null
+++ b/infra/libs/git2/data/__init__.py
@@ -0,0 +1,18 @@
+# Copyright 2014 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.
+
+################################################################################
+# Commit
+################################################################################
+# Exceptions
+from infra.libs.git2.data.commit import PartialCommit
+from infra.libs.git2.data.commit import UnexpectedHeader
+
+# Classes
+from infra.libs.git2.data.commit import CommitUser
+from infra.libs.git2.data.commit import CommitTimestamp
+from infra.libs.git2.data.commit import CommitData
+
+# Data
+from infra.libs.git2.data.commit import NULL_TIMESTAMP