Dart: Adds a program to create snapshots of Mojo apps.

mojo/dart/dart_snapshotter/logging.cc

 // Copyright 2015 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.
 
-#include "tonic/dart_error.h"
+#include "mojo/dart/dart_snapshotter/logging.h"
 
 #include "base/logging.h"
 
-namespace tonic {
-
-namespace DartError {
-
-const char kInvalidArgument[] = "Invalid argument.";
-
-}  // namespace DartError
-
 bool LogIfError(Dart_Handle handle) {
   if (Dart_IsError(handle)) {
     LOG(ERROR) << Dart_GetError(handle);
 
     // Only unhandled exceptions have stacktraces.
     if (!Dart_ErrorHasException(handle))
       return true;
 
     Dart_Handle stacktrace = Dart_ErrorGetStacktrace(handle);
     const char* stacktrace_cstr = "";
     Dart_StringToCString(Dart_ToString(stacktrace), &stacktrace_cstr);
     LOG(ERROR) << stacktrace_cstr;
     return true;
   }
   return false;
 }
 
-}  // namespace tonic
+std::string StringFromDart(Dart_Handle string) {
+  CHECK(Dart_IsString(string));
+  uint8_t* utf8_array;
+  intptr_t length;
+  Dart_StringToUTF8(string, &utf8_array, &length);
+  return std::string(reinterpret_cast<const char*>(utf8_array), length);
+}
+
+Dart_Handle StringToDart(const std::string& string) {
+  return Dart_NewStringFromUTF8(reinterpret_cast<const uint8_t*>(string.data()),
+                                string.length());
+}