Fix gen_snapshot product mode build

runtime/include/dart_api.h

 /*
  * Copyright (c) 2012, 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 RUNTIME_INCLUDE_DART_API_H_
 #define RUNTIME_INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 2913 matching lines @@
 DART_EXPORT Dart_Handle Dart_GetClass(Dart_Handle library,
                                       Dart_Handle class_name);
 /* TODO(asiva): The above method needs to be removed once all uses
  * of it are removed from the embedder code. */
 
 /**
  * Returns the url from which a library was loaded.
  */
 DART_EXPORT Dart_Handle Dart_LibraryUrl(Dart_Handle library);
 
+
+/**
+ * \return An array of libraries.
+ */
+DART_EXPORT Dart_Handle Dart_GetLoadedLibraries();
+
+
 DART_EXPORT Dart_Handle Dart_LookupLibrary(Dart_Handle url);
 /* TODO(turnidge): Consider returning Dart_Null() when the library is
  * not found to distinguish that from a true error case. */
 
 
 /**
  * Report an loading error for the library.
  *
  * \param library The library that failed to load.
  * \param error The Dart error instance containing the load error.
@@ skipping 310 matching lines @@
 
 
 /**
  *  Returns whether the VM only supports running from precompiled snapshots and
  *  not from any other kind of snapshot or from source (that is, the VM was
  *  compiled with DART_PRECOMPILED_RUNTIME).
  */
 DART_EXPORT bool Dart_IsPrecompiledRuntime();
 
 #endif /* INCLUDE_DART_API_H_ */ /* NOLINT */