Make Dart_LoadLibrary and Dart_LoadSource take line and column offsets like Dart_LoadScript.

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 2622 matching lines @@
  *
  * \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);
+                                         Dart_Handle source,
+                                         intptr_t line_offset,
+                                         intptr_t column_offset);
 
 /**
  * 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 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.
  */
 DART_EXPORT Dart_Handle Dart_LoadSource(Dart_Handle library,
                                         Dart_Handle url,
-                                        Dart_Handle source);
+                                        Dart_Handle source,
+                                        intptr_t line_offset,
+                                        intptr_t column_offset);
 /* TODO(turnidge): Rename to Dart_LibraryLoadSource? */
 
 
 /**
  * Loads a patch source string into a library.
  *
  * \param library A library
  * \param url A url identifying the origin of the patch source
  * \param source A string of Dart patch source
  */
@@ skipping 147 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 */