Fix dump_dependency_json.

pylib/gyp/generator/dump_dependency_json.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import os
 import gyp
 import gyp.common
 import gyp.msvs_emulation
 import json
 import sys
 
 generator_supports_multiple_toolsets = True
 
 generator_wants_static_library_dependencies_adjusted = False
 
 generator_default_variables = {
 }
 for dirname in ['INTERMEDIATE_DIR', 'SHARED_INTERMEDIATE_DIR', 'PRODUCT_DIR',
                 'LIB_DIR', 'SHARED_LIB_DIR']:
   # Some gyp steps fail if these are empty(!).
   generator_default_variables[dirname] = 'dir'
 for unused in ['RULE_INPUT_PATH', 'RULE_INPUT_ROOT', 'RULE_INPUT_NAME',
                'RULE_INPUT_DIRNAME', 'RULE_INPUT_EXT',
                'EXECUTABLE_PREFIX', 'EXECUTABLE_SUFFIX',
                'STATIC_LIB_PREFIX', 'STATIC_LIB_SUFFIX',
-               'SHARED_LIB_PREFIX', 'SHARED_LIB_SUFFIX']:
+               'SHARED_LIB_PREFIX', 'SHARED_LIB_SUFFIX',
+               'CONFIGURATION_NAME']:
   generator_default_variables[unused] = ''
 
 
 def CalculateVariables(default_variables, params):
   generator_flags = params.get('generator_flags', {})
   for key, val in generator_flags.items():
     default_variables.setdefault(key, val)
   default_variables.setdefault('OS', gyp.common.GetFlavor(params))
 
   flavor = gyp.common.GetFlavor(params)
@@ skipping 45 matching lines @@
 
     for dep in target_dicts[target].get('dependencies', []):
       edges[target].append(dep)
       targets_to_visit.append(dep)
 
   filename = 'dump.json'
   f = open(filename, 'w')
   json.dump(edges, f)
   f.close()
   print 'Wrote json to %s.' % filename