In Android framework, make tools depend on jsoncpp

bench/ResultsWriter.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Helper functions for result writing operations.
  */
 
 #include "ResultsWriter.h"
 
-#ifdef SK_BUILD_JSON_WRITER
-
 Json::Value* SkFindNamedNode(Json::Value* root, const char name[]) {
     Json::Value* search_results = NULL;
     for(Json::Value::iterator iter = root->begin();
             iter!= root->end(); ++iter) {
         if(SkString(name).equals((*iter)["name"].asCString())) {
             search_results = &(*iter);
             break;
         }
     }
 
     if(search_results != NULL) {
         return search_results;
     } else {
         Json::Value* new_val = &(root->append(Json::Value()));
         (*new_val)["name"] = name;
         return new_val;
     }
 }
 
-#endif // SK_BUILD_JSON_WRITER