combine base_unittest.py modules from gm and tools

general cleanup, which will also help with http://skbug.com/2752 ('split existing "gpu" GM results into "gl" and "gles"')

R=rmistry@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/397103003
diff --git a/tools/tests/fix_pythonpath.py b/tools/tests/fix_pythonpath.py
new file mode 100755
index 0000000..a746a18
--- /dev/null
+++ b/tools/tests/fix_pythonpath.py
@@ -0,0 +1,20 @@
+#!/usr/bin/python
+
+"""
+Copyright 2014 Google Inc.
+
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+
+Adds possibly-needed directories to PYTHONPATH, if they aren't already there.
+"""
+
+import os
+import sys
+
+TRUNK_DIRECTORY = os.path.abspath(os.path.join(
+    os.path.dirname(__file__), os.pardir, os.pardir))
+for subdir in ['tools']:
+  fullpath = os.path.join(TRUNK_DIRECTORY, subdir)
+  if fullpath not in sys.path:
+    sys.path.append(fullpath)