Add support for file URIs and extracting the file path from file URIs

runtime/lib/uri.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#ifndef BIN_VMSERVICE_H_
-#define BIN_VMSERVICE_H_
-
-#include "include/dart_api.h"
+#include "vm/bootstrap_natives.h"
+#include "vm/native_entry.h"
+#include "vm/object.h"
 
 namespace dart {
-namespace bin {
 
+DEFINE_NATIVE_ENTRY(Uri_isWindowsPlatform, 0) {
+#if defined(_WIN32)
+  return Bool::True().raw();
+#else
+  return Bool::False().raw();
+#endif
+}
 
-}  // namespace bin
 }  // namespace dart
-
-#endif  // BIN_VMSERVICE_H_