Python 3 compatibility

pylib/gyp/generator/dump_dependency_json.py

Index: pylib/gyp/generator/dump_dependency_json.py
diff --git a/pylib/gyp/generator/dump_dependency_json.py b/pylib/gyp/generator/dump_dependency_json.py
index 160eafe2efeca012f826095891b33d6b44273f9c..2bf3f397d69507092dcf659bf98a5c60c65ebd1c 100644
--- a/pylib/gyp/generator/dump_dependency_json.py
+++ b/pylib/gyp/generator/dump_dependency_json.py
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from __future__ import print_function
+
 import collections
 import os
 import gyp
@@ -96,4 +98,4 @@ def GenerateOutput(target_list, target_dicts, data, params):
   f = open(filename, 'w')
   json.dump(edges, f)
   f.close()
-  print 'Wrote json to %s.' % filename
+  print('Wrote json to %s.' % filename)