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

gcl.py

Index: gcl.py
diff --git a/gcl.py b/gcl.py
index 4dfed3389635abbaf2a736a3cf6121614d6b94ea..84819279b9de3b2e258e450bc0387ef75bdfae30 100755
--- a/gcl.py
+++ b/gcl.py
@@ -831,16 +831,6 @@ def TryChange(change_info, args, swallow_exception):
     root = os.path.join(root, '')
     return subpath[len(root):]
 
-  # Try to find the gclient root.
-  def FindGclientRootDir(from_dir):
-    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
-
   trychange_args = []
   settings = {
     'port': GetCodeReviewSetting('TRYSERVER_HTTP_PORT'),
@@ -854,7 +844,7 @@ def TryChange(change_info, args, swallow_exception):
     if v:
       trychange_args.extend(['--' + k, v])
 
-  gclient_root = FindGclientRootDir(GetRepositoryRoot())
+  gclient_root = gclient_utils.FindGclientRoot(GetRepositoryRoot())
   if gclient_root:
     trychange_args.extend(['--root', PathDifference(gclient_root,
                                                     GetRepositoryRoot())])