Beginning support for library prefixes in the dart API.

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
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 2560 matching lines @@
  */
 DART_EXPORT Dart_Handle Dart_LibraryGetClassNames(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.
 
 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.
+ * \param prefix The prefix under which to import.
+ *
+ * \return A valid handle if no error occurs during the operation.
+ */
 DART_EXPORT Dart_Handle Dart_LibraryImportLibrary(Dart_Handle library,
-                                                  Dart_Handle import);
+                                                  Dart_Handle import,
+                                                  Dart_Handle prefix);
 
 /**
  * Loads a source string into a library.
  *
  * \param library A library
  * \param url A url identifying the origin of the source
  * \param source A string of Dart source
  *
  * \return A valid handle if no error occurs during the operation.
  */
@@ skipping 25 matching lines @@
 
 typedef void (*Dart_FileWriterFunction)(const char* buffer, int64_t num_bytes);
 
 // Support for generating symbol maps for use by the Linux perf tool.
 DART_EXPORT void Dart_InitPerfEventsSupport(Dart_FileWriterFunction function);
 
 // Support for generating flow graph compiler debugging output into a file.
 DART_EXPORT void Dart_InitFlowGraphPrinting(Dart_FileWriterFunction function);
 
 #endif  // INCLUDE_DART_API_H_