- Fix Isolate.spawn when running from snapshot.

runtime/bin/platform_patch.dart

Index: runtime/bin/platform_patch.dart
diff --git a/runtime/bin/platform_patch.dart b/runtime/bin/platform_patch.dart
index 50439c5002803d8eb191f1b1cdb7617b721b2ac6..577bbb6dffcd67677533290438c93ccc362cf8a5 100644
--- a/runtime/bin/platform_patch.dart
+++ b/runtime/bin/platform_patch.dart
@@ -26,4 +26,19 @@ patch class _Platform {
       => VMLibraryHooks.packageRootString;
   /* patch */ static String _packageConfig()
       => VMLibraryHooks.packageConfigString;
+
+  // This script singleton is written to by the embedder if applicable.
+  /* patch */ static void set _nativeScript(String path) {
+    if (path.startsWith('http:') ||
+        path.startsWith('https:') ||
+        path.startsWith('package:') ||
+        path.startsWith('dart:') ||
+        path.startsWith('data:') ||
+        path.startsWith('file:')) {
+      script = Uri.parse(path);
+    } else {
+      script = Uri.base.resolveUri(new Uri.file(path));
+    }
+    VMLibraryHooks.platformScript = script;
+  }
 }