Set the loaded_ flag in RawLibrary when it is completely loaded. This

vm/object.h

 // Copyright (c) 2011, 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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "vm/assert.h"
 #include "vm/dart.h"
 #include "vm/globals.h"
@@ skipping 1501 matching lines @@
 };
 
 
 class Library : public Object {
  public:
   RawString* name() const { return raw_ptr()->name_; }
   void SetName(const String& name) const;
 
   RawString* url() const { return raw_ptr()->url_; }
   RawString* private_key() const { return raw_ptr()->private_key_; }
+  bool loaded() const { return raw_ptr()->loaded_; }
+  void SetLoaded() const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawLibrary));
   }
 
   static RawLibrary* New(const String& url);
 
   // Library scope name dictionary.
   void AddClass(const Class& cls) const;
   void AddObject(const Object& obj, const String& name) const;
@@ skipping 1480 matching lines @@
 }
 
 
 void Context::SetAt(intptr_t index, const Instance& value) const {
   StorePointer(InstanceAddr(index), value.raw());
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_