Fix dartium build break.

runtime/bin/gen_snapshot.cc

 // Copyright (c) 2013, 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.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 522 matching lines @@
     // invoke the dart uri resolution code like _resolveURI. App script is
     // loaded into a separate isolate.
 
     SetupForUriResolution();
 
     // Get handle to builtin library.
     Dart_Handle builtin_lib =
         Builtin::LoadAndCheckLibrary(Builtin::kBuiltinLibrary);
     CHECK_RESULT(builtin_lib);
 
+    // Ensure that we mark all libraries as loaded.
+    Dart_Handle result = Dart_FinalizeLoading(false);
+    if (Dart_IsError(result)) {
+      const char* err_msg = Dart_GetError(library);
+      Log::PrintErr("Errors encountered while loading: %s\n", err_msg);
+      Dart_ExitScope();
+      Dart_ShutdownIsolate();
+      exit(255);
+    }
+
     // Prepare for script loading by setting up the 'print' and 'timer'
     // closures and setting up 'package root' for URI resolution.
     result = DartUtils::PrepareForScriptLoading(package_root, builtin_lib);
     CHECK_RESULT(result);
     Dart_ExitScope();
 
     UriResolverIsolateScope::isolate = isolate;
 
     // Now we create an isolate into which we load all the code that needs to
     // be in the snapshot.
@@ skipping 21 matching lines @@
   }
   return 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   return dart::bin::main(argc, argv);
 }