Add full_move flag to GIT.GenerateDiff and Factor out FindGclientRootDir into gclient_utils.

gclient_utils.py

 # Copyright 2009 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 289 matching lines @@
     raise Error(msg)
 
 
 def IsUsingGit(root, paths):
   """Returns True if we're using git to manage any of our checkouts.
   |entries| is a list of paths to check."""
   for path in paths:
     if os.path.exists(os.path.join(root, path, '.git')):
       return True
   return False
+
+def FindGclientRoot(from_dir):
+  """Tries to find the gclient root."""
+  path = os.path.realpath(from_dir)
+  while not os.path.exists(os.path.join(path, '.gclient')):
+    next = os.path.split(path)
+    if not next[1]:
+      return None
+    path = next[0]
+  return path