Skipped syncing svn working copy which has a .hg subdirectory.

BUG=57783
TEST=none
Review URL: http://codereview.chromium.org/3601007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@61459 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -681,12 +681,17 @@ class SVNWrapper(SCMWrapper):
     Raises:
       Error: if can't get URL for relative path.
     """
-    # Only update if git is not controlling the directory.
+    # Only update if git or hg is not controlling the directory.
     git_path = os.path.join(self.checkout_path, '.git')
     if os.path.exists(git_path):
       print('________ found .git directory; skipping %s' % self.relpath)
       return
 
+    hg_path = os.path.join(self.checkout_path, '.hg')
+    if os.path.exists(hg_path):
+      print('________ found .hg directory; skipping %s' % self.relpath)
+      return
+
     if args:
       raise gclient_utils.Error("Unsupported argument(s): %s" % ",".join(args))