Add some ArgumentError and RangeError constructors that capture more information.

tools/dom/scripts/systemhtml.py

 #!/usr/bin/python
 # 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.
 
 """This module provides shared functionality for the system to generate
 Dart:html APIs from the IDL database."""
 
 import emitter
 import logging
@@ skipping 770 matching lines @@
       indexed_getter = 'this.getItem(index)'
     elif any(op.id == 'item' for op in self._interface.operations):
       indexed_getter = 'this.item(index)'
 
     if indexed_getter:
       self._members_emitter.Emit(
           '\n'
           '  $TYPE operator[](int index) {\n'
           '    if (JS("bool", "# >>> 0 !== # || # >= #", index,\n'
           '        index, index, length))\n'
-          '      throw new RangeError.range(index, 0, length);\n'
+          '      throw new RangeError.index(index, this);\n'
           '    return $INDEXED_GETTER;\n'
           '  }',
           INDEXED_GETTER=indexed_getter,
           TYPE=self.SecureOutputType(element_type, False, True))
 
     if 'CustomIndexedSetter' in self._interface.ext_attrs:
       self._members_emitter.Emit(
           '\n'
           '  void operator[]=(int index, $TYPE value) {'
           ' JS("void", "#[#] = #", this, index, value); }',
@@ skipping 432 matching lines @@
 
     library_emitter = emitter.FileEmitter(self._dart_path)
     library_file_dir = os.path.dirname(self._dart_path)
     auxiliary_dir = os.path.relpath(auxiliary_dir, library_file_dir)
     emitters = library_emitter.Emit(
         self._template, AUXILIARY_DIR=massage_path(auxiliary_dir))
     if isinstance(emitters, tuple):
       imports_emitter, map_emitter = emitters
     else:
       imports_emitter, map_emitter = emitters, None
-      
+
 
     for path in sorted(self._paths):
       relpath = os.path.relpath(path, library_file_dir)
       imports_emitter.Emit(
           "part '$PATH';\n", PATH=massage_path(relpath))
 
     if map_emitter:
       items = self._typeMap.items()
       items.sort()
       for (idl_name, dart_name) in items:
         map_emitter.Emit(
           "  '$IDL_NAME': () => $DART_NAME,\n",
           IDL_NAME=idl_name,
           DART_NAME=dart_name)
-      
+
 
 # ------------------------------------------------------------------------------
 
 class DartLibraries():
   def __init__(self, libraries, template_loader, library_type, output_dir):
     self._libraries = {}
     for library_name in libraries:
       self._libraries[library_name] = DartLibrary(
           library_name, template_loader, library_type, output_dir)
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def AddTypeEntry(self, library_name, idl_name, dart_name):
     self._libraries[library_name].AddTypeEntry(idl_name, dart_name)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)