Move grit from DEPS into src.

tools/grit/grit/lazy_re.py

Index: tools/grit/grit/lazy_re.py
diff --git a/tools/grit/grit/lazy_re.py b/tools/grit/grit/lazy_re.py
new file mode 100755
index 0000000000000000000000000000000000000000..a532cd04c1856f1160402e410073248dfb10ea48
--- /dev/null
+++ b/tools/grit/grit/lazy_re.py
@@ -0,0 +1,45 @@
+#!/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.
+
+'''In GRIT, we used to compile a lot of regular expressions at parse
+time.  Since many of them never get used, we use lazy_re to compile
+them on demand the first time they are used, thus speeding up startup
+time in some cases.
+'''
+
+import re
+
+
+class LazyRegexObject(object):
+  '''This object creates a RegexObject with the arguments passed in
+  its constructor, the first time any attribute except the several on
+  the class itself is accessed.  This accomplishes lazy compilation of
+  the regular expression while maintaining a nearly-identical
+  interface.
+  '''
+
+  def __init__(self, *args, **kwargs):
+    self._stash_args = args
+    self._stash_kwargs = kwargs
+    self._lazy_re = None
+
+  def _LazyInit(self):
+    if not self._lazy_re:
+      self._lazy_re = re.compile(*self._stash_args, **self._stash_kwargs)
+
+  def __getattribute__(self, name):
+    if name in ('_LazyInit', '_lazy_re', '_stash_args', '_stash_kwargs'):
+      return object.__getattribute__(self, name)
+    else:
+      self._LazyInit()
+      return getattr(self._lazy_re, name)
+
+
+def compile(*args, **kwargs):
+  '''Creates a LazyRegexObject that, when invoked on, will compile a
+  re.RegexObject (via re.compile) with the same arguments passed to
+  this function, and delegate almost all of its methods to it.
+  '''
+  return LazyRegexObject(*args, **kwargs)