using_skia_and_harfbuzz: compile w/ Android NDK

tools/using_skia_and_harfbuzz.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This sample progam demonstrates how to use Skia and HarfBuzz to
 // produce a PDF file from UTF-8 text in stdin.
 
 #include <cassert>
+#include <cstdlib>
 #include <iostream>
 #include <map>
 #include <string>
+#include <sstream>
 
 #include <hb-ot.h>
 
 #include "SkCanvas.h"
 #include "SkDocument.h"
 #include "SkStream.h"
 #include "SkTextBlob.h"
 #include "SkTypeface.h"
 
 struct BaseOption {
@@ skipping 14 matching lines @@
   Option(std::string selector, std::string description, T defaultValue) :
     BaseOption(selector, description),
     value(defaultValue) {}
 };
 
 struct DoubleOption : Option<double> {
   virtual void set(std::string _value) {
     value = atof(_value.c_str());
   }
   virtual std::string valueToString() {
-    return std::to_string(value);
+      std::ostringstream stm;
+      stm << value;
+      return stm.str();
   }
   DoubleOption(std::string selector, std::string description, double defaultValue) :
     Option<double>(selector, description, defaultValue) {}
 };
 
 struct SkStringOption : Option<SkString> {
   virtual void set(std::string _value) {
     value = _value.c_str();
   }
   virtual std::string valueToString() {
@@ skipping 237 matching lines @@
     Config config(argc, argv);
 
     Placement placement(config, new SkFILEWStream(config.output_file_name->value.c_str()));
     for (std::string line; std::getline(std::cin, line);) {
       placement.WriteLine(line.c_str());
     }
     placement.Close();
 
     return 0;
 }