Beginning support for library prefixes in the dart API.

runtime/bin/builtin.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 <stdio.h>
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 
 
 Builtin::builtin_lib_props Builtin::builtin_libraries_[] = {
   /*      url_                    source_       has_natives_  */
   { DartUtils::kBuiltinLibURL, builtin_source_, true  },
   { DartUtils::kJsonLibURL,    json_source_,    false },
   { DartUtils::kUriLibURL,     uri_source_,     false },
   { DartUtils::kCryptoLibURL,  crypto_source_,  false },
   { DartUtils::kIOLibURL,      io_source_,      true  },
   { DartUtils::kUtfLibURL,     utf_source_,     false },
   { DartUtils::kWebLibURL,     web_source_,     false }
 };
 
 
 static void ImportBuiltinLibIntoLib(
     const char* liburl, Dart_Handle builtin_lib) {
   Dart_Handle url = Dart_NewString(liburl);
   Dart_Handle lib = Dart_LookupLibrary(url);
+  Dart_Handle prefix = Dart_NewString("");
   DART_CHECK_VALID(lib);
-  DART_CHECK_VALID(Dart_LibraryImportLibrary(lib, builtin_lib));
+  DART_CHECK_VALID(Dart_LibraryImportLibrary(lib, builtin_lib, prefix));
 }
 
 
 Dart_Handle Builtin::Source(BuiltinLibraryId id) {
   ASSERT((sizeof(builtin_libraries_) / sizeof(builtin_lib_props)) ==
          kInvalidLibrary);
   ASSERT(id >= kBuiltinLibrary && id < kInvalidLibrary);
   return Dart_NewString(builtin_libraries_[id].source_);
 }
 
@@ skipping 27 matching lines @@
       SetupLibrary(library, id);
     }
   }
   DART_CHECK_VALID(library);
   return library;
 }
 
 
 void Builtin::ImportLibrary(Dart_Handle library, BuiltinLibraryId id) {
   Dart_Handle imported_library = LoadLibrary(id);
+  Dart_Handle prefix = Dart_NewString("");
   // Import the library into current library.
-  DART_CHECK_VALID(Dart_LibraryImportLibrary(library, imported_library));
+  DART_CHECK_VALID(Dart_LibraryImportLibrary(library,
+                                             imported_library,
+                                             prefix));
 }