spawnUri. Take two. This time I'll wait for Anton before committing :-).

runtime/vm/object_store.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_STORE_H_
 #define VM_OBJECT_STORE_H_
 
 #include "vm/object.h"
 
 namespace dart {
@@ skipping 425 matching lines @@
   }
   void set_builtin_library(const Library& value) {
     builtin_library_ = value.raw();
   }
 
   RawLibrary* root_library() const { return root_library_; }
   void set_root_library(const Library& value) {
     root_library_ = value.raw();
   }
 
+  RawArray* import_map() const { return import_map_; }
+  void set_import_map(const Array& value) {
+    import_map_ = value.raw();
+  }
+
   // Returns head of list of registered libraries.
   RawLibrary* registered_libraries() const { return registered_libraries_; }
   void set_registered_libraries(const Library& value) {
     registered_libraries_ = value.raw();
   }
 
   RawGrowableObjectArray* pending_classes() const { return pending_classes_; }
   void set_pending_classes(const GrowableObjectArray& value) {
     ASSERT(!value.IsNull());
     pending_classes_ = value.raw();
@@ skipping 110 matching lines @@
   RawArray* symbol_table_;
   RawArray* canonical_type_arguments_;
   RawLibrary* core_library_;
   RawLibrary* core_impl_library_;
   RawLibrary* math_library_;
   RawLibrary* isolate_library_;
   RawLibrary* mirrors_library_;
   RawLibrary* native_wrappers_library_;
   RawLibrary* builtin_library_;
   RawLibrary* root_library_;
+  RawArray* import_map_;
   RawLibrary* registered_libraries_;
   RawGrowableObjectArray* pending_classes_;
   RawError* sticky_error_;
   RawContext* empty_context_;
   RawInstance* stack_overflow_;
   RawInstance* out_of_memory_;
   RawArray* keyword_symbols_;
   RawObject** to() { return reinterpret_cast<RawObject**>(&keyword_symbols_); }
 
   friend class SnapshotReader;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectStore);
 };
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_STORE_H_