Turned on SkSL->GLSL compiler

src/sksl/SkSLUtil.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.
  */
 
 #include "SkSLUtil.h"
 
 namespace SkSL {
 
+std::string to_string(double value) {
+    std::stringstream buffer;
+    buffer << std::setprecision(std::numeric_limits<double>::digits10) << value;
+    std::string result = buffer.str();
+    if (result.find_last_of(".") == std::string::npos && 
+        result.find_last_of("e") == std::string::npos) {
+        result += ".0";
+    }
+    return result;
+}
+
+std::string to_string(int32_t value) {
+    std::stringstream buffer;
+    buffer << value;
+    return buffer.str();
+}
+
+std::string to_string(uint32_t value) {
+    std::stringstream buffer;
+    buffer << value;
+    return buffer.str();
+}
+
+std::string to_string(int64_t value) {
+    std::stringstream buffer;
+    buffer << value;
+    return buffer.str();
+}
+
+std::string to_string(uint64_t value) {
+    std::stringstream buffer;
+    buffer << value;
+    return buffer.str();
+}
+
 int stoi(std::string s) {
     return atoi(s.c_str());
 }
 
 double stod(std::string s) {
     return atof(s.c_str());
 }
 
 long stol(std::string s) {
     return atol(s.c_str());
 }
 
 void sksl_abort() {
 #ifdef SKIA
     sk_abort_no_print();
     exit(1);
 #else
     abort();
 #endif
 }
 
 } // namespace