Wholesale move sky/engine/tonic to tonic

tonic/dart_error.h

Index: tonic/dart_error.h
diff --git a/tonic/dart_error.h b/tonic/dart_error.h
new file mode 100644
index 0000000000000000000000000000000000000000..52605ce9491a3554920acf0282af1dfb2de20274
--- /dev/null
+++ b/tonic/dart_error.h
@@ -0,0 +1,21 @@
+// 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.
+
+#ifndef SKY_ENGINE_TONIC_DART_ERROR_H_
+#define SKY_ENGINE_TONIC_DART_ERROR_H_
+
+#include "dart/runtime/include/dart_api.h"
+
+namespace blink {
+
+namespace DartError {
+extern const char kInvalidArgument[];
+}  // namespace DartError
+
+bool LogIfError(Dart_Handle handle);
+
+}  // namespace blink
+
+#endif  // SKY_ENGINE_TONIC_DART_ERROR_H_
+