Introduce sky_packager

sky/tools/packager/logging.cc

Index: sky/tools/packager/logging.cc
diff --git a/sky/engine/tonic/dart_error.cc b/sky/tools/packager/logging.cc
similarity index 58%
copy from sky/engine/tonic/dart_error.cc
copy to sky/tools/packager/logging.cc
index d733c3328a60131644add913abcf50de8fb96190..e61820cb9725165ae14f6576eeca615fc75142e8 100644
--- a/sky/engine/tonic/dart_error.cc
+++ b/sky/tools/packager/logging.cc
@@ -2,19 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "sky/engine/config.h"
-#include "sky/engine/tonic/dart_error.h"
+#include "sky/tools/packager/logging.h"
 
 #include "base/logging.h"
 
-namespace blink {
-
-namespace DartError {
-
-const char kInvalidArgument[] = "Invalid argument.";
-
-}  // namespace DartError
-
 bool LogIfError(Dart_Handle handle) {
   if (Dart_IsError(handle)) {
     LOG(ERROR) << Dart_GetError(handle);
@@ -32,4 +23,15 @@ bool LogIfError(Dart_Handle handle) {
   return false;
 }
 
-}  // namespace blink
+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());
+}