Add "checked" parameter to Isolate.spawnUri.

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index 57b23e9e7072c59e2dbf1b710a3f1d1550eb399e..81df3f18b5cac698f16d39082ee97843ab62ec18 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -932,7 +932,8 @@ class IsolateSpawnState {
                     const char* package_root,
                     const Instance& args,
                     const Instance& message,
-                    bool paused);
+                    bool paused,
+                    bool checked);
   ~IsolateSpawnState();
 
   Isolate* isolate() const { return isolate_; }
@@ -946,6 +947,7 @@ class IsolateSpawnState {
   char* function_name() const { return function_name_; }
   bool is_spawn_uri() const { return library_url_ == NULL; }
   bool paused() const { return paused_; }
+  bool checked_mode() const { return checked_; }
 
   RawObject* ResolveFunction();
   RawInstance* BuildArgs(Zone* zone);
@@ -965,6 +967,7 @@ class IsolateSpawnState {
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   bool paused_;
+  bool checked_;
 };
 
 }  // namespace dart