In Android framework, make tools depend on jsoncpp

gyp/jsoncpp.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO: This file was copied from the external dependency
 # third_party/externals/jsoncpp-chromium/jsoncpp.gyp , at revision 125399,
 # with directory paths modified to work at this level.
 #
 # It would be better for us to depend on that gypfile within the external
 # dependency, but so far we have been unable to make that work reliably.
 # See https://code.google.com/p/skia/issues/detail?id=1023
 # and https://code.google.com/p/skia/source/detail?r=7115
 
 {
   'variables': {
     'skia_warnings_as_errors': 0,
   },
   'targets': [
     {
       'target_name': 'jsoncpp',
       'type': 'static_library',
       'conditions': [
-        ['skia_build_json_writer', {
+        ['skia_use_system_json == 0', {
           'defines': [
             'JSON_USE_EXCEPTION=0',
           ],
           'sources': [
             '../third_party/externals/jsoncpp/include/json/assertions.h',
             '../third_party/externals/jsoncpp/include/json/autolink.h',
             '../third_party/externals/jsoncpp/include/json/config.h',
             '../third_party/externals/jsoncpp/include/json/features.h',
             '../third_party/externals/jsoncpp/include/json/forwards.h',
             '../third_party/externals/jsoncpp/include/json/json.h',
@@ skipping 18 matching lines @@
             ],
           },
           'cflags': [
             '-w',
           ],
         }],
       ],
     },
   ],
 }