VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/lib/class_id.cc

 // Copyright (c) 2014, 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.
 
 #include "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 
 namespace dart {
 
 DEFINE_NATIVE_ENTRY(ClassID_getID, 1) {
   const Instance& instance =
       Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
   return Smi::New(instance.GetClassId());
 }
 
+
+DEFINE_NATIVE_ENTRY(ClassID_byName, 1) {
+  GET_NON_NULL_NATIVE_ARGUMENT(String, name, arguments->NativeArgAt(0));
+
+#define CLASS_LIST_WITH_NULL(V)                                                \
+  V(Null)                                                                      \
+  CLASS_LIST_NO_OBJECT(V)
+
+#define COMPARE(clazz)                                                         \
+  if (name.Equals(#clazz)) return Smi::New(k##clazz##Cid);
+
+  CLASS_LIST_WITH_NULL(COMPARE)
+
+#undef COMPARE
+#undef CLASS_LIST_WITH_NULL
+
+  UNREACHABLE();
+  return Smi::New(-1);
+}
+
 }  // namespace dart