Handle load errors in deferred code

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 INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 2606 matching lines @@
 
 /**
  * Returns the url from which a library was loaded.
  */
 DART_EXPORT Dart_Handle Dart_LibraryUrl(Dart_Handle library);
 
 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.
+ *
+ * \return If the VM handles the error, the return value is
+ * a null handle. If it doesn't handle the error, the error
+ * object is returned.
+ */
+DART_EXPORT Dart_Handle Dart_LibraryHandleError(Dart_Handle library,
+                                                Dart_Handle error);
+
+
 DART_EXPORT Dart_Handle Dart_LoadLibrary(Dart_Handle url,
                                          Dart_Handle source);
 
 /**
  * Imports a library into another library, optionally with a prefix.
  * If no prefix is required, an empty string or Dart_Null() can be
  * supplied.
  *
  * \param library The library into which to import another library.
  * \param import The library to import.
@@ skipping 177 matching lines @@
  * NOTE: If multiple callbacks with the same name are registered, only the
  * last callback registered will be remembered.
  */
 DART_EXPORT void Dart_RegisterRootServiceRequestCallback(
     const char* name,
     Dart_ServiceRequestCallback callback,
     void* user_data);
 
 
 #endif  /* INCLUDE_DART_API_H_ */  /* NOLINT */