Python 3 compatibility

tools/pretty_gyp.py

Index: tools/pretty_gyp.py
diff --git a/tools/pretty_gyp.py b/tools/pretty_gyp.py
index d5736bbd4a60099c14e21d792b4b9de9969a3b5b..5060d1d9e29decda76c60699a8581d60c5ae0f5c 100755
--- a/tools/pretty_gyp.py
+++ b/tools/pretty_gyp.py
@@ -6,6 +6,8 @@
 
 """Pretty-prints the contents of a GYP file."""
 
+from __future__ import print_function
+
 import sys
 import re
 
@@ -125,15 +127,15 @@ def prettyprint_input(lines):
         (brace_diff, after) = count_braces(line)
       if brace_diff != 0:
         if after:
-          print " " * (basic_offset * indent) + line
+          print(" " * (basic_offset * indent) + line)
           indent += brace_diff
         else:
           indent += brace_diff
-          print " " * (basic_offset * indent) + line
+          print(" " * (basic_offset * indent) + line)
       else:
-        print " " * (basic_offset * indent) + line
+        print(" " * (basic_offset * indent) + line)
     else:
-      print ""
+      print("")
     last_line = line