isolates refactor: this change introduces 'dart:isolate' as a library. This is a

runtime/vm/bootstrap_natives.cc

Index: runtime/vm/bootstrap_natives.cc
diff --git a/runtime/vm/bootstrap_natives.cc b/runtime/vm/bootstrap_natives.cc
index 2c0d9175ce61d114e86be30aea25fa2ba18a1e73..d3da9f539cc8b5a28148233498f04123bfab7d03 100644
--- a/runtime/vm/bootstrap_natives.cc
+++ b/runtime/vm/bootstrap_natives.cc
@@ -55,10 +55,16 @@ void Bootstrap::SetupNativeResolver() {
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(
       reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
+
   library = Library::CoreImplLibrary();
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(
       reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
+
+  library = Library::IsolateLibrary();
+  ASSERT(!library.IsNull());
+  library.set_native_entry_resolver(
+      reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
 }
 
 }  // namespace dart