Move grit from DEPS into src.

tools/grit/grit/tool/unit.py

Index: tools/grit/grit/tool/unit.py
diff --git a/tools/grit/grit/tool/unit.py b/tools/grit/grit/tool/unit.py
new file mode 100755
index 0000000000000000000000000000000000000000..f48326292500687122a207f2b02f2b14b9b0f3e5
--- /dev/null
+++ b/tools/grit/grit/tool/unit.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+'''GRIT tool that runs the unit test suite for GRIT.'''
+
+
+import unittest
+
+import grit.test_suite_all
+from grit.tool import interface
+
+
+class UnitTestTool(interface.Tool):
+  '''By using this tool (e.g. 'grit unit') you run all the unit tests for GRIT.
+This happens in the environment that is set up by the basic GRIT runner, i.e.
+whether to run disconnected has been specified, etc.'''
+
+  def ShortDescription(self):
+    return 'Use this tool to run all the unit tests for GRIT.'
+
+  def Run(self, opts, args):
+    return unittest.TextTestRunner(verbosity=2).run(
+      grit.test_suite_all.TestSuiteAll())
+