Split dart:builtin into dart:builtin and dart:io.

runtime/bin/builtin_nolib.cc

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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 <stdio.h>
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 
 
-Dart_Handle Builtin::Source() {
+Dart_Handle Builtin::Source(BuiltinLibraryId id) {
   UNREACHABLE();
   return Dart_Null();
 }
 
 
-void Builtin::SetupLibrary(Dart_Handle builtin_lib) {
+void Builtin::SetupLibrary(Dart_Handle library, BuiltinLibraryId id) {
   UNREACHABLE();
 }
 
 
-void Builtin::ImportLibrary(Dart_Handle library) {
-  Dart_Handle url = Dart_NewString(DartUtils::kBuiltinLibURL);
-  Dart_Handle builtin_lib = Dart_LookupLibrary(url);
+Dart_Handle Builtin::LoadLibrary(BuiltinLibraryId id) {
+  UNREACHABLE();
+  return Dart_Null();
+}
+
+
+void Builtin::ImportLibrary(Dart_Handle library, BuiltinLibraryId id) {
+  Dart_Handle url;
+  if (id == kBuiltinLibrary) {
+    url = Dart_NewString(DartUtils::kBuiltinLibURL);
+  } else {
+    ASSERT(id == kIOLibrary);
+    url = Dart_NewString(DartUtils::kIOLibURL);
+  }
+  Dart_Handle imported_library = Dart_LookupLibrary(url);
   // Import the builtin library into current library.
-  DART_CHECK_VALID(builtin_lib);
-  DART_CHECK_VALID(Dart_LibraryImportLibrary(library, builtin_lib));
+  DART_CHECK_VALID(imported_library);
+  DART_CHECK_VALID(Dart_LibraryImportLibrary(library, imported_library));
 }