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

runtime/vm/unit_test.cc

 // 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.
 
 #include "vm/unit_test.h"
 
 #include <stdio.h>
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
@@ skipping 86 matching lines @@
       return Builtin::LoadAndCheckLibrary(Builtin::kBuiltinLibrary);
     } else {
       return DartUtils::NewError("Do not know how to load '%s'", url_chars);
     }
   }
   if (is_io_library) {
     ASSERT(tag == Dart_kSourceTag);
     return Dart_LoadSource(library,
                            url,
                            Builtin::PartSource(Builtin::kIOLibrary,
-                                               url_chars));
+                                               url_chars),
+                           0, 0);
   }
   return DartUtils::LoadSource(library, url, tag, url_chars);
 }
 
 
 Dart_Handle TestCase::LoadTestScript(const char* script,
                                      Dart_NativeEntryResolver resolver,
                                      const char* lib_url,
                                      bool finalize_classes) {
   Dart_Handle url = NewString(lib_url);
@@ skipping 128 matching lines @@
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate != NULL);
   ASSERT(ClassFinalizer::AllClassesFinalized());
   const Error& error = Error::Handle(Compiler::CompileFunction(isolate,
                                                                function));
   return error.IsNull();
 }
 
 
 }  // namespace dart