Removed Dartium SDK libs

sdk/lib/js/dartium/js_dartium.dart

Index: sdk/lib/js/dartium/js_dartium.dart
diff --git a/sdk/lib/js/dartium/js_dartium.dart b/sdk/lib/js/dartium/js_dartium.dart
deleted file mode 100644
index 6c3ed0d68059b401aa6e57a6cb685f100dbf5cb5..0000000000000000000000000000000000000000
--- a/sdk/lib/js/dartium/js_dartium.dart
+++ /dev/null
@@ -1,1706 +0,0 @@
-// Copyright (c) 2013, 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.
-
-/**
- * Support for interoperating with JavaScript.
- *
- * This library provides access to JavaScript objects from Dart, allowing
- * Dart code to get and set properties, and call methods of JavaScript objects
- * and invoke JavaScript functions. The library takes care of converting
- * between Dart and JavaScript objects where possible, or providing proxies if
- * conversion isn't possible.
- *
- * This library does not yet make Dart objects usable from JavaScript, their
- * methods and proeprties are not accessible, though it does allow Dart
- * functions to be passed into and called from JavaScript.
- *
- * [JsObject] is the core type and represents a proxy of a JavaScript object.
- * JsObject gives access to the underlying JavaScript objects properties and
- * methods. `JsObject`s can be acquired by calls to JavaScript, or they can be
- * created from proxies to JavaScript constructors.
- *
- * The top-level getter [context] provides a [JsObject] that represents the
- * global object in JavaScript, usually `window`.
- *
- * The following example shows an alert dialog via a JavaScript call to the
- * global function `alert()`:
- *
- *     import 'dart:js';
- *
- *     main() => context.callMethod('alert', ['Hello from Dart!']);
- *
- * This example shows how to create a [JsObject] from a JavaScript constructor
- * and access its properties:
- *
- *     import 'dart:js';
- *
- *     main() {
- *       var object = new JsObject(context['Object']);
- *       object['greeting'] = 'Hello';
- *       object['greet'] = (name) => "${object['greeting']} $name";
- *       var message = object.callMethod('greet', ['JavaScript']);
- *       context['console'].callMethod('log', [message]);
- *     }
- *
- * ## Proxying and automatic conversion
- *
- * When setting properties on a JsObject or passing arguments to a Javascript
- * method or function, Dart objects are automatically converted or proxied to
- * JavaScript objects. When accessing JavaScript properties, or when a Dart
- * closure is invoked from JavaScript, the JavaScript objects are also
- * converted to Dart.
- *
- * Functions and closures are proxied in such a way that they are callable. A
- * Dart closure assigned to a JavaScript property is proxied by a function in
- * JavaScript. A JavaScript function accessed from Dart is proxied by a
- * [JsFunction], which has a [apply] method to invoke it.
- *
- * The following types are transferred directly and not proxied:
- *
- * * "Basic" types: `null`, `bool`, `num`, `String`, `DateTime`
- * * `Blob`
- * * `Event`
- * * `HtmlCollection`
- * * `ImageData`
- * * `KeyRange`
- * * `Node`
- * * `NodeList`
- * * `TypedData`, including its subclasses like `Int32List`, but _not_
- *   `ByteBuffer`
- * * `Window`
- *
- * ## Converting collections with JsObject.jsify()
- *
- * To create a JavaScript collection from a Dart collection use the
- * [JsObject.jsify] constructor, which converts Dart [Map]s and [Iterable]s
- * into JavaScript Objects and Arrays.
- *
- * The following expression creates a new JavaScript object with the properties
- * `a` and `b` defined:
- *
- *     var jsMap = new JsObject.jsify({'a': 1, 'b': 2});
- *
- * This expression creates a JavaScript array:
- *
- *     var jsArray = new JsObject.jsify([1, 2, 3]);
- */
-library dart.js;
-
-import 'dart:collection' show ListMixin;
-import 'dart:nativewrappers';
-import 'dart:math' as math;
-import 'dart:mirrors' as mirrors;
-import 'dart:html' as html;
-import 'dart:_blink' as _blink;
-import 'dart:html_common' as html_common;
-import 'dart:indexed_db' as indexed_db;
-import 'dart:typed_data';
-import 'dart:core';
-
-import 'cached_patches.dart';
-
-// Pretend we are always in checked mode as we aren't interested in users
-// running Dartium code outside of checked mode.
-@Deprecated("Internal Use Only")
-final bool CHECK_JS_INVOCATIONS = true;
-
-final String _DART_RESERVED_NAME_PREFIX = r'JS$';
-// If a private class is defined to use @JS we need to inject a non-private
-// class with a name that will not cause collisions in the library so we can
-// make JSObject implement that interface even though it is in a different
-// library.
-final String escapePrivateClassPrefix = r'$JSImplClass23402893498';
-
-// Exposed to return ArrayBufferView from a TypedArray passed to readPixels.
-toArrayBufferView(TypedData data) native "Dart_TypedArray_ArrayBufferView";
-
-String _stripReservedNamePrefix(String name) =>
-    name.startsWith(_DART_RESERVED_NAME_PREFIX)
-        ? name.substring(_DART_RESERVED_NAME_PREFIX.length)
-        : name;
-
-_buildArgs(Invocation invocation) {
-  if (invocation.namedArguments.isEmpty) {
-    return invocation.positionalArguments;
-  } else {
-    var varArgs = new Map<String, Object>();
-    invocation.namedArguments.forEach((symbol, val) {
-      varArgs[mirrors.MirrorSystem.getName(symbol)] = val;
-    });
-    return invocation.positionalArguments.toList()
-      ..add(JsNative.jsify(varArgs));
-  }
-}
-
-final _allowedMethods = new Map<Symbol, _DeclarationSet>();
-final _allowedGetters = new Map<Symbol, _DeclarationSet>();
-final _allowedSetters = new Map<Symbol, _DeclarationSet>();
-
-final _jsInterfaceTypes = new Set<mirrors.ClassMirror>();
-@Deprecated("Internal Use Only")
-Iterable<mirrors.ClassMirror> get jsInterfaceTypes => _jsInterfaceTypes;
-
-class _StringLiteralEscape {
-  // Character code constants.
-  static const int BACKSPACE = 0x08;
-  static const int TAB = 0x09;
-  static const int NEWLINE = 0x0a;
-  static const int CARRIAGE_RETURN = 0x0d;
-  static const int FORM_FEED = 0x0c;
-  static const int QUOTE = 0x22;
-  static const int CHAR_$ = 0x24;
-  static const int CHAR_0 = 0x30;
-  static const int BACKSLASH = 0x5c;
-  static const int CHAR_b = 0x62;
-  static const int CHAR_f = 0x66;
-  static const int CHAR_n = 0x6e;
-  static const int CHAR_r = 0x72;
-  static const int CHAR_t = 0x74;
-  static const int CHAR_u = 0x75;
-
-  final StringSink _sink;
-
-  _StringLiteralEscape(this._sink);
-
-  void writeString(String string) {
-    _sink.write(string);
-  }
-
-  void writeStringSlice(String string, int start, int end) {
-    _sink.write(string.substring(start, end));
-  }
-
-  void writeCharCode(int charCode) {
-    _sink.writeCharCode(charCode);
-  }
-
-  /// ('0' + x) or ('a' + x - 10)
-  static int hexDigit(int x) => x < 10 ? 48 + x : 87 + x;
-
-  /// Write, and suitably escape, a string's content as a JSON string literal.
-  void writeStringContent(String s) {
-    // Identical to JSON string literal escaping except that we also escape $.
-    int offset = 0;
-    final int length = s.length;
-    for (int i = 0; i < length; i++) {
-      int charCode = s.codeUnitAt(i);
-      if (charCode > BACKSLASH) continue;
-      if (charCode < 32) {
-        if (i > offset) writeStringSlice(s, offset, i);
-        offset = i + 1;
-        writeCharCode(BACKSLASH);
-        switch (charCode) {
-          case BACKSPACE:
-            writeCharCode(CHAR_b);
-            break;
-          case TAB:
-            writeCharCode(CHAR_t);
-            break;
-          case NEWLINE:
-            writeCharCode(CHAR_n);
-            break;
-          case FORM_FEED:
-            writeCharCode(CHAR_f);
-            break;
-          case CARRIAGE_RETURN:
-            writeCharCode(CHAR_r);
-            break;
-          default:
-            writeCharCode(CHAR_u);
-            writeCharCode(CHAR_0);
-            writeCharCode(CHAR_0);
-            writeCharCode(hexDigit((charCode >> 4) & 0xf));
-            writeCharCode(hexDigit(charCode & 0xf));
-            break;
-        }
-      } else if (charCode == QUOTE ||
-          charCode == BACKSLASH ||
-          charCode == CHAR_$) {
-        if (i > offset) writeStringSlice(s, offset, i);
-        offset = i + 1;
-        writeCharCode(BACKSLASH);
-        writeCharCode(charCode);
-      }
-    }
-    if (offset == 0) {
-      writeString(s);
-    } else if (offset < length) {
-      writeStringSlice(s, offset, length);
-    }
-  }
-
-  /**
-   * Serialize a [num], [String], [bool], [Null], [List] or [Map] value.
-   *
-   * Returns true if the value is one of these types, and false if not.
-   * If a value is both a [List] and a [Map], it's serialized as a [List].
-   */
-  bool writeStringLiteral(String str) {
-    writeString('"');
-    writeStringContent(str);
-    writeString('"');
-  }
-}
-
-String _escapeString(String str) {
-  StringBuffer output = new StringBuffer();
-  new _StringLiteralEscape(output)..writeStringLiteral(str);
-  return output.toString();
-}
-
-/// A collection of methods where all methods have the same name.
-/// This class is intended to optimize whether a specific invocation is
-/// appropriate for at least some of the methods in the collection.
-class _DeclarationSet {
-  _DeclarationSet() : _members = <mirrors.DeclarationMirror>[];
-
-  static bool _checkType(obj, mirrors.TypeMirror type) {
-    if (obj == null) return true;
-    return mirrors.reflectType(obj.runtimeType).isSubtypeOf(type);
-  }
-
-  /// Returns whether the return [value] has a type is consistent with the
-  /// return type from at least one of the members matching the DeclarationSet.
-  bool _checkReturnType(value) {
-    if (value == null) return true;
-    var valueMirror = mirrors.reflectType(value.runtimeType);
-    for (var member in _members) {
-      if (member is mirrors.VariableMirror || member.isGetter) {
-        // TODO(jacobr): actually check return types for getters that return
-        // function types.
-        return true;
-      } else {
-        if (valueMirror.isSubtypeOf(member.returnType)) return true;
-      }
-    }
-    return false;
-  }
-
-  /**
-   * Check whether the [invocation] is consistent with the [member] mirror.
-   */
-  bool _checkDeclaration(
-      Invocation invocation, mirrors.DeclarationMirror member) {
-    if (member is mirrors.VariableMirror || (member as dynamic).isGetter) {
-      // TODO(jacobr): actually check method types against the function type
-      // returned by the getter or field.
-      return true;
-    }
-    var parameters = (member as dynamic).parameters;
-    var positionalArguments = invocation.positionalArguments;
-    // Too many arguments
-    if (parameters.length < positionalArguments.length) return false;
-    // Too few required arguments.
-    if (parameters.length > positionalArguments.length &&
-        !parameters[positionalArguments.length].isOptional) return false;
-    for (var i = 0; i < positionalArguments.length; i++) {
-      if (parameters[i].isNamed) {
-        // Not enough positional arguments.
-        return false;
-      }
-      if (!_checkType(invocation.positionalArguments[i], parameters[i].type))
-        return false;
-    }
-    if (invocation.namedArguments.isNotEmpty) {
-      var startNamed;
-      for (startNamed = parameters.length - 1; startNamed >= 0; startNamed--) {
-        if (!parameters[startNamed].isNamed) break;
-      }
-      startNamed++;
-
-      // TODO(jacobr): we are unnecessarily using an O(n^2) algorithm here.
-      // If we have JS APIs with a large number of named parameters we should
-      // optimize this. Either use a HashSet or invert this, walking over
-      // parameters, querying invocation, and making sure we match
-      //invocation.namedArguments.size keys.
-      for (var name in invocation.namedArguments.keys) {
-        bool match = false;
-        for (var j = startNamed; j < parameters.length; j++) {
-          var p = parameters[j];
-          if (p.simpleName == name) {
-            if (!_checkType(
-                invocation.namedArguments[name], parameters[j].type))
-              return false;
-            match = true;
-            break;
-          }
-        }
-        if (match == false) return false;
-      }
-    }
-    return true;
-  }
-
-  bool checkInvocation(Invocation invocation) {
-    for (var member in _members) {
-      if (_checkDeclaration(invocation, member)) return true;
-    }
-    return false;
-  }
-
-  void add(mirrors.DeclarationMirror mirror) {
-    _members.add(mirror);
-  }
-
-  final List<mirrors.DeclarationMirror> _members;
-}
-
-/**
- * Temporary method that we hope to remove at some point. This method should
- * generally only be called by machine generated code.
- */
-@Deprecated("Internal Use Only")
-void registerJsInterfaces([List<Type> classes]) {
-  // This method is now obsolete in Dartium.
-}
-
-void _registerJsInterfaces(List<Type> classes) {
-  for (Type type in classes) {
-    mirrors.ClassMirror typeMirror = mirrors.reflectType(type);
-    typeMirror.declarations.forEach((symbol, declaration) {
-      if (declaration is mirrors.MethodMirror ||
-          declaration is mirrors.VariableMirror && !declaration.isStatic) {
-        bool treatAsGetter = false;
-        bool treatAsSetter = false;
-        if (declaration is mirrors.VariableMirror) {
-          treatAsGetter = true;
-          if (!declaration.isConst && !declaration.isFinal) {
-            treatAsSetter = true;
-          }
-        } else {
-          if (declaration.isGetter) {
-            treatAsGetter = true;
-          } else if (declaration.isSetter) {
-            treatAsSetter = true;
-          } else if (!declaration.isConstructor) {
-            _allowedMethods
-                .putIfAbsent(symbol, () => new _DeclarationSet())
-                .add(declaration);
-          }
-        }
-        if (treatAsGetter) {
-          _allowedGetters
-              .putIfAbsent(symbol, () => new _DeclarationSet())
-              .add(declaration);
-          _allowedMethods
-              .putIfAbsent(symbol, () => new _DeclarationSet())
-              .add(declaration);
-        }
-        if (treatAsSetter) {
-          _allowedSetters
-              .putIfAbsent(symbol, () => new _DeclarationSet())
-              .add(declaration);
-        }
-      }
-    });
-  }
-}
-
-_finalizeJsInterfaces() native "Js_finalizeJsInterfaces";
-
-String _getJsName(mirrors.DeclarationMirror mirror) {
-  if (_atJsType != null) {
-    for (var annotation in mirror.metadata) {
-      if (annotation.type.reflectedType == _atJsType) {
-        try {
-          var name = annotation.reflectee.name;
-          return name != null ? name : "";
-        } catch (e) {}
-      }
-    }
-  }
-  return null;
-}
-
-bool _isAnonymousClass(mirrors.ClassMirror mirror) {
-  for (var annotation in mirror.metadata) {
-    if (mirrors.MirrorSystem.getName(annotation.type.simpleName) ==
-        "_Anonymous") {
-      mirrors.LibraryMirror library = annotation.type.owner;
-      var uri = library.uri;
-      // make sure the annotation is from package://js
-      if (uri.scheme == 'package' && uri.path == 'js/js.dart') {
-        return true;
-      }
-    }
-  }
-  return false;
-}
-
-bool _hasJsName(mirrors.DeclarationMirror mirror) {
-  if (_atJsType != null) {
-    for (var annotation in mirror.metadata) {
-      if (annotation.type.reflectedType == _atJsType) {
-        return true;
-      }
-    }
-  }
-  return false;
-}
-
-var _domNameType;
-
-bool hasDomName(mirrors.DeclarationMirror mirror) {
-  var location = mirror.location;
-  if (location == null || location.sourceUri.scheme != 'dart') return false;
-  for (var annotation in mirror.metadata) {
-    if (mirrors.MirrorSystem.getName(annotation.type.simpleName) == "DomName") {
-      // We can't make sure the annotation is in dart: as Dartium believes it
-      // is file://dart/sdk/lib/html/html_common/metadata.dart
-      // instead of a proper dart: location.
-      return true;
-    }
-  }
-  return false;
-}
-
-_getJsMemberName(mirrors.DeclarationMirror mirror) {
-  var name = _getJsName(mirror);
-  return name == null || name.isEmpty
-      ? _stripReservedNamePrefix(_getDeclarationName(mirror))
-      : name;
-}
-
-// TODO(jacobr): handle setters correctyl.
-String _getDeclarationName(mirrors.DeclarationMirror declaration) {
-  var name = mirrors.MirrorSystem.getName(declaration.simpleName);
-  if (declaration is mirrors.MethodMirror && declaration.isSetter) {
-    assert(name.endsWith("="));
-    name = name.substring(0, name.length - 1);
-  }
-  return name;
-}
-
-final _JS_LIBRARY_PREFIX = "js_library";
-final _UNDEFINED_VAR = "_UNDEFINED_JS_CONST";
-
-String _accessJsPath(String path) => _accessJsPathHelper(path.split("."));
-
-String _accessJsPathHelper(Iterable<String> parts) {
-  var sb = new StringBuffer();
-  sb
-    ..write('${_JS_LIBRARY_PREFIX}.JsNative.getProperty(' * parts.length)
-    ..write("${_JS_LIBRARY_PREFIX}.context");
-  for (var p in parts) {
-    sb.write(", ${_escapeString(p)})");
-  }
-  return sb.toString();
-}
-
-// TODO(jacobr): remove these helpers and add JsNative.setPropertyDotted,
-// getPropertyDotted, and callMethodDotted helpers that would be simpler
-// and more efficient.
-String _accessJsPathSetter(String path) {
-  var parts = path.split(".");
-  return "${_JS_LIBRARY_PREFIX}.JsNative.setProperty(${_accessJsPathHelper(parts.getRange(0, parts.length - 1))
-      }, ${_escapeString(parts.last)}, v)";
-}
-
-String _accessJsPathCallMethodHelper(String path) {
-  var parts = path.split(".");
-  return "${_JS_LIBRARY_PREFIX}.JsNative.callMethod(${_accessJsPathHelper(parts.getRange(0, parts.length - 1))
-      }, ${_escapeString(parts.last)},";
-}
-
-@Deprecated("Internal Use Only")
-void addMemberHelper(
-    mirrors.MethodMirror declaration, String path, StringBuffer sb,
-    {bool isStatic: false, String memberName}) {
-  if (!declaration.isConstructor) {
-    var jsName = _getJsMemberName(declaration);
-    path = (path != null && path.isNotEmpty) ? "${path}.${jsName}" : jsName;
-  }
-  var name = memberName != null ? memberName : _getDeclarationName(declaration);
-  if (declaration.isConstructor) {
-    sb.write("factory");
-  } else if (isStatic) {
-    sb.write("static");
-  } else {
-    sb.write("@patch");
-  }
-  sb.write(" ");
-  if (declaration.isGetter) {
-    sb.write("get $name => ${_accessJsPath(path)};");
-  } else if (declaration.isSetter) {
-    sb.write("set $name(v) {\n"
-        "  ${_JS_LIBRARY_PREFIX}.safeForTypedInterop(v);\n"
-        "  return ${_accessJsPathSetter(path)};\n"
-        "}\n");
-  } else {
-    sb.write("$name(");
-    bool hasOptional = false;
-    int i = 0;
-    var args = <String>[];
-    for (var p in declaration.parameters) {
-      assert(!p.isNamed); // TODO(jacobr): throw.
-      assert(!p.hasDefaultValue);
-      if (i > 0) {
-        sb.write(", ");
-      }
-      if (p.isOptional && !hasOptional) {
-        sb.write("[");
-        hasOptional = true;
-      }
-      var arg = "p$i";
-      args.add(arg);
-      sb.write(arg);
-      if (p.isOptional) {
-        sb.write("=${_UNDEFINED_VAR}");
-      }
-      i++;
-    }
-    if (hasOptional) {
-      sb.write("]");
-    }
-    // TODO(jacobr):
-    sb.write(") {\n");
-    for (var arg in args) {
-      sb.write("  ${_JS_LIBRARY_PREFIX}.safeForTypedInterop($arg);\n");
-    }
-    sb.write("  return ");
-    if (declaration.isConstructor) {
-      sb.write("${_JS_LIBRARY_PREFIX}.JsNative.callConstructor(");
-      sb..write(_accessJsPath(path))..write(",");
-    } else {
-      sb.write(_accessJsPathCallMethodHelper(path));
-    }
-    sb.write("[${args.join(",")}]");
-
-    if (hasOptional) {
-      sb.write(".takeWhile((i) => i != ${_UNDEFINED_VAR}).toList()");
-    }
-    sb.write(");");
-    sb.write("}\n");
-  }
-  sb.write("\n");
-}
-
-bool _isExternal(mirrors.MethodMirror mirror) {
-  // This try-catch block is a workaround for BUG:24834.
-  try {
-    return mirror.isExternal;
-  } catch (e) {}
-  return false;
-}
-
-List<String> _generateExternalMethods(
-    List<String> libraryPaths, bool useCachedPatches) {
-  var staticCodegen = <String>[];
-
-  if (libraryPaths.length == 0) {
-    mirrors.currentMirrorSystem().libraries.forEach((uri, library) {
-      var library_name = "${uri.scheme}:${uri.path}";
-      if (useCachedPatches && cached_patches.containsKey(library_name)) {
-        // Use the pre-generated patch files for DOM dart:nnnn libraries.
-        var patch = cached_patches[library_name];
-        staticCodegen.addAll(patch);
-      } else if (_hasJsName(library)) {
-        // Library marked with @JS
-        _generateLibraryCodegen(uri, library, staticCodegen);
-      } else if (!useCachedPatches) {
-        // Can't use the cached patches file, instead this is a signal to generate
-        // the patches for this file.
-        _generateLibraryCodegen(uri, library, staticCodegen);
-      }
-    }); // End of library foreach
-  } else {
-    // Used to generate cached_patches.dart file for all IDL generated dart:
-    // files to the WebKit DOM.
-    for (var library_name in libraryPaths) {
-      var parts = library_name.split(':');
-      var uri = new Uri(scheme: parts[0], path: parts[1]);
-      var library = mirrors.currentMirrorSystem().libraries[uri];
-      _generateLibraryCodegen(uri, library, staticCodegen);
-    }
-  }
-
-  return staticCodegen;
-}
-
-_generateLibraryCodegen(uri, library, staticCodegen) {
-  // Is it a dart generated library?
-  var dartLibrary = uri.scheme == 'dart';
-
-  var sb = new StringBuffer();
-  String jsLibraryName = _getJsName(library);
-
-  // Sort by patch file by its declaration name.
-  var sortedDeclKeys = library.declarations.keys.toList();
-  sortedDeclKeys.sort((a, b) => mirrors.MirrorSystem
-      .getName(a)
-      .compareTo(mirrors.MirrorSystem.getName(b)));
-
-  sortedDeclKeys.forEach((name) {
-    var declaration = library.declarations[name];
-    if (declaration is mirrors.MethodMirror) {
-      if ((_hasJsName(declaration) || jsLibraryName != null) &&
-          _isExternal(declaration)) {
-        addMemberHelper(declaration, jsLibraryName, sb);
-      }
-    } else if (declaration is mirrors.ClassMirror) {
-      mirrors.ClassMirror clazz = declaration;
-      var isDom = dartLibrary ? hasDomName(clazz) : false;
-      var isJsInterop = _hasJsName(clazz);
-      if (isDom || isJsInterop) {
-        // TODO(jacobr): verify class implements JavaScriptObject.
-        var className = mirrors.MirrorSystem.getName(clazz.simpleName);
-        bool isPrivateUserDefinedClass =
-            className.startsWith('_') && !dartLibrary;
-        var classNameImpl = '${className}Impl';
-        var sbPatch = new StringBuffer();
-        if (isJsInterop) {
-          String jsClassName = _getJsMemberName(clazz);
-
-          jsInterfaceTypes.add(clazz);
-          clazz.declarations.forEach((name, declaration) {
-            if (declaration is! mirrors.MethodMirror ||
-                !_isExternal(declaration)) return;
-            if (declaration.isFactoryConstructor && _isAnonymousClass(clazz)) {
-              sbPatch.write("  factory ${className}(");
-              int i = 0;
-              var args = <String>[];
-              for (var p in declaration.parameters) {
-                args.add(mirrors.MirrorSystem.getName(p.simpleName));
-                i++;
-              }
-              if (args.isNotEmpty) {
-                sbPatch
-                  ..write('{')
-                  ..write(
-                      args.map((name) => '$name:${_UNDEFINED_VAR}').join(", "))
-                  ..write('}');
-              }
-              sbPatch.write(") {\n"
-                  "    var ret = ${_JS_LIBRARY_PREFIX}.JsNative.newObject();\n");
-              i = 0;
-              for (var p in declaration.parameters) {
-                assert(p.isNamed); // TODO(jacobr): throw.
-                var name = args[i];
-                var jsName = _stripReservedNamePrefix(
-                    mirrors.MirrorSystem.getName(p.simpleName));
-                sbPatch.write("    if($name != ${_UNDEFINED_VAR}) {\n"
-                    "      ${_JS_LIBRARY_PREFIX}.safeForTypedInterop($name);\n"
-                    "      ${_JS_LIBRARY_PREFIX}.JsNative.setProperty(ret, ${_escapeString(jsName)}, $name);\n"
-                    "    }\n");
-                i++;
-              }
-
-              sbPatch.write("  return ret;"
-                  "}\n");
-            } else if (declaration.isConstructor ||
-                declaration.isFactoryConstructor) {
-              sbPatch.write("  ");
-              addMemberHelper(
-                  declaration,
-                  (jsLibraryName != null && jsLibraryName.isNotEmpty)
-                      ? "${jsLibraryName}.${jsClassName}"
-                      : jsClassName,
-                  sbPatch,
-                  isStatic: true,
-                  memberName: className);
-            }
-          }); // End of clazz.declarations.forEach
-
-          clazz.staticMembers.forEach((memberName, member) {
-            if (_isExternal(member)) {
-              sbPatch.write("  ");
-              addMemberHelper(
-                  member,
-                  (jsLibraryName != null && jsLibraryName.isNotEmpty)
-                      ? "${jsLibraryName}.${jsClassName}"
-                      : jsClassName,
-                  sbPatch,
-                  isStatic: true);
-            }
-          });
-        }
-        if (isDom) {
-          sbPatch.write(
-              "  static Type get instanceRuntimeType => ${classNameImpl};\n");
-        }
-        if (isPrivateUserDefinedClass) {
-          sb.write("""
-class ${escapePrivateClassPrefix}${className} implements $className {}
-""");
-        }
-
-        if (sbPatch.isNotEmpty) {
-          var typeVariablesClause = '';
-          if (!clazz.typeVariables.isEmpty) {
-            typeVariablesClause =
-                '<${clazz.typeVariables.map((m) => mirrors.MirrorSystem.getName(m.simpleName)).join(',')}>';
-          }
-          sb.write("""
-@patch class $className$typeVariablesClause {
-$sbPatch
-}
-""");
-          if (isDom) {
-            sb.write("""
-class $classNameImpl$typeVariablesClause extends $className implements ${_JS_LIBRARY_PREFIX}.JSObjectInterfacesDom {
-  ${classNameImpl}.internal_() : super.internal_();
-  get runtimeType => $className;
-  toString() => super.toString();
-}
-""");
-          }
-        }
-      }
-    }
-  });
-  if (sb.isNotEmpty) {
-    staticCodegen
-      ..add(uri.toString())
-      ..add("${uri}_js_interop_patch.dart")
-      ..add("""
-import 'dart:js' as ${_JS_LIBRARY_PREFIX};
-
-/**
- * Placeholder object for cases where we need to determine exactly how many
- * args were passed to a function.
- */
-const ${_UNDEFINED_VAR} = const Object();
-
-${sb}
-""");
-  }
-}
-
-// Remember the @JS type to compare annotation type.
-var _atJsType = -1;
-
-void setupJsTypeCache() {
-  // Cache the @JS Type.
-  if (_atJsType == -1) {
-    var uri = new Uri(scheme: "package", path: "js/js.dart");
-    var jsLibrary = mirrors.currentMirrorSystem().libraries[uri];
-    if (jsLibrary != null) {
-      // @ JS used somewhere.
-      var jsDeclaration = jsLibrary.declarations[new Symbol("JS")];
-      _atJsType = jsDeclaration.reflectedType;
-    } else {
-      // @ JS not used in any library.
-      _atJsType = null;
-    }
-  }
-}
-
-/**
- * Generates part files defining source code for JSObjectImpl, all DOM classes
- * classes. This codegen  is needed so that type checks for all registered
- * JavaScript interop classes pass.
- * If genCachedPatches is true then the patch files don't exist this is a special
- * signal to generate and emit the patches to stdout to be captured and put into
- * the file sdk/lib/js/dartium/cached_patches.dart
- */
-List<String> _generateInteropPatchFiles(
-    List<String> libraryPaths, genCachedPatches) {
-  // Cache the @JS Type.
-  if (_atJsType == -1) setupJsTypeCache();
-
-  var ret =
-      _generateExternalMethods(libraryPaths, genCachedPatches ? false : true);
-  var libraryPrefixes = new Map<mirrors.LibraryMirror, String>();
-  var prefixNames = new Set<String>();
-  var sb = new StringBuffer();
-
-  var implements = <String>[];
-  var implementsArray = <String>[];
-  var implementsDom = <String>[];
-  var listMirror = mirrors.reflectType(List);
-  var functionMirror = mirrors.reflectType(Function);
-  var jsObjectMirror = mirrors.reflectType(JSObject);
-
-  for (var typeMirror in jsInterfaceTypes) {
-    mirrors.LibraryMirror libraryMirror = typeMirror.owner;
-    var location = libraryMirror.location;
-    var dartLibrary = location != null && location.sourceUri.scheme == 'dart';
-
-    var prefixName;
-    if (libraryPrefixes.containsKey(libraryMirror)) {
-      prefixName = libraryPrefixes[libraryMirror];
-    } else {
-      var basePrefixName =
-          mirrors.MirrorSystem.getName(libraryMirror.simpleName);
-      basePrefixName = basePrefixName.replaceAll('.', '_');
-      if (basePrefixName.isEmpty) basePrefixName = "lib";
-      prefixName = basePrefixName;
-      var i = 1;
-      while (prefixNames.contains(prefixName)) {
-        prefixName = '$basePrefixName$i';
-        i++;
-      }
-      prefixNames.add(prefixName);
-      libraryPrefixes[libraryMirror] = prefixName;
-    }
-    var isArray = typeMirror.isSubtypeOf(listMirror);
-    var isFunction = typeMirror.isSubtypeOf(functionMirror);
-    var isJSObject = typeMirror.isSubtypeOf(jsObjectMirror);
-    var className = mirrors.MirrorSystem.getName(typeMirror.simpleName);
-    var isPrivateUserDefinedClass = className.startsWith('_') && !dartLibrary;
-    if (isPrivateUserDefinedClass)
-      className = '${escapePrivateClassPrefix}${className}';
-    var fullName = '${prefixName}.${className}';
-    (isArray ? implementsArray : implements).add(fullName);
-    if (!isArray && !isFunction && !isJSObject) {
-      // For DOM classes we need to be a bit more conservative at tagging them
-      // as implementing JS interop classes risks strange unintended
-      // consequences as unrleated code may have instanceof checks.  Checking
-      // for isJSObject ensures we do not accidentally pull in existing
-      // dart:html classes as they all have JSObject as a base class.
-      // Note that methods from these classes can still be called on a
-      // dart:html instance but checked mode type checks will fail. This is
-      // not ideal but is better than causing strange breaks in existing
-      // code that uses dart:html.
-      // TODO(jacobr): consider throwing compile time errors if @JS classes
-      // extend JSObject as that case cannot be safely handled in Dartium.
-      implementsDom.add(fullName);
-    }
-  }
-  libraryPrefixes.forEach((libraryMirror, prefix) {
-    sb.writeln('import "${libraryMirror.uri}" as $prefix;');
-  });
-  buildImplementsClause(classes) =>
-      classes.isEmpty ? "" : "implements ${classes.join(', ')}";
-  var implementsClause = buildImplementsClause(implements);
-  var implementsClauseDom = buildImplementsClause(implementsDom);
-  // TODO(jacobr): only certain classes need to be implemented by
-  // JsFunctionImpl.
-  var allTypes = []..addAll(implements)..addAll(implementsArray);
-  sb.write('''
-class JSObjectImpl extends JSObject $implementsClause {
-  JSObjectImpl.internal() : super.internal();
-}
-
-class JSFunctionImpl extends JSFunction $implementsClause {
-  JSFunctionImpl.internal() : super.internal();
-}
-
-class JSArrayImpl extends JSArray ${buildImplementsClause(implementsArray)} {
-  JSArrayImpl.internal() : super.internal();
-}
-
-// Interfaces that are safe to slam on all DOM classes.
-// Adding implementsClause would be risky as it could contain Function which
-// is likely to break a lot of instanceof checks.
-abstract class JSObjectInterfacesDom $implementsClauseDom {
-}
-
-@patch class JSObject {
-  static Type get instanceRuntimeType => JSObjectImpl;
-}
-
-@patch class JSFunction {
-  static Type get instanceRuntimeType => JSFunctionImpl;
-}
-
-@patch class JSArray {
-  static Type get instanceRuntimeType => JSArrayImpl;
-}
-
-_registerAllJsInterfaces() {
-  _registerJsInterfaces([${allTypes.join(", ")}]);
-}
-
-''');
-  ret..addAll(["dart:js", "JSInteropImpl.dart", sb.toString()]);
-  return ret;
-}
-
-// Start of block of helper methods facilitating emulating JavaScript Array
-// methods on Dart List objects passed to JavaScript via JS interop.
-// TODO(jacobr): match JS more closely.
-String _toStringJs(obj) => '$obj';
-
-// TODO(jacobr): this might not exactly match JS semantics but should be
-// adequate for now.
-int _toIntJs(obj) {
-  if (obj is int) return obj;
-  if (obj is num) return obj.toInt();
-  return num.parse('$obj'.trim(), (_) => 0).toInt();
-}
-
-// TODO(jacobr): this might not exactly match JS semantics but should be
-// adequate for now.
-num _toNumJs(obj) {
-  return obj is num ? obj : num.parse('$obj'.trim(), (_) => 0);
-}
-
-/// Match the behavior of setting List length in JavaScript with the exception
-/// that Dart does not distinguish undefined and null.
-_setListLength(List list, rawlen) {
-  num len = _toNumJs(rawlen);
-  if (len is! int || len < 0) {
-    throw new RangeError("Invalid array length");
-  }
-  if (len > list.length) {
-    _arrayExtend(list, len);
-  } else if (len < list.length) {
-    list.removeRange(len, list.length);
-  }
-  return rawlen;
-}
-
-// TODO(jacobr): should we really bother with this method instead of just
-// shallow copying to a JS array and calling the JavaScript join method?
-String _arrayJoin(List list, sep) {
-  if (sep == null) {
-    sep = ",";
-  }
-  return list.map((e) => e == null ? "" : e.toString()).join(sep.toString());
-}
-
-// TODO(jacobr): should we really bother with this method instead of just
-// shallow copying to a JS array and using the toString method?
-String _arrayToString(List list) => _arrayJoin(list, ",");
-
-int _arrayPush(List list, List args) {
-  for (var e in args) {
-    list.add(e);
-  }
-  return list.length;
-}
-
-_arrayPop(List list) {
-  if (list.length > 0) return list.removeLast();
-}
-
-// TODO(jacobr): would it be better to just copy input to a JS List
-// and call Array.concat?
-List _arrayConcat(List input, List args) {
-  var ret = new List.from(input);
-  for (var e in args) {
-    // TODO(jacobr): technically in ES6 we should use
-    // Symbol.isConcatSpreadable to determine whether call addAll. Once v8
-    // supports it, we can make all Dart classes implementing Iterable
-    // specify isConcatSpreadable and tweak this behavior to allow Iterable.
-    if (e is List) {
-      ret.addAll(e);
-    } else {
-      ret.add(e);
-    }
-  }
-  return ret;
-}
-
-List _arraySplice(List input, List args) {
-  int start = 0;
-  if (args.length > 0) {
-    var rawStart = _toIntJs(args[0]);
-    if (rawStart < 0) {
-      start = math.max(0, input.length - rawStart);
-    } else {
-      start = math.min(input.length, rawStart);
-    }
-  }
-  var end = start;
-  if (args.length > 1) {
-    var rawDeleteCount = _toIntJs(args[1]);
-    if (rawDeleteCount < 0) rawDeleteCount = 0;
-    end = math.min(input.length, start + rawDeleteCount);
-  }
-  var replacement = [];
-  var removedElements = input.getRange(start, end).toList();
-  if (args.length > 2) {
-    replacement = args.getRange(2, args.length);
-  }
-  input.replaceRange(start, end, replacement);
-  return removedElements;
-}
-
-List _arrayReverse(List l) {
-  for (var i = 0, j = l.length - 1; i < j; i++, j--) {
-    var tmp = l[i];
-    l[i] = l[j];
-    l[j] = tmp;
-  }
-  return l;
-}
-
-_arrayShift(List l) {
-  if (l.isEmpty) return null; // Technically we should return undefined.
-  return l.removeAt(0);
-}
-
-int _arrayUnshift(List l, List args) {
-  l.insertAll(0, args);
-  return l.length;
-}
-
-_arrayExtend(List l, int newLength) {
-  for (var i = l.length; i < newLength; i++) {
-    // TODO(jacobr): we'd really like to add undefined to better match
-    // JavaScript semantics.
-    l.add(null);
-  }
-}
-
-List _arraySort(List l, rawCompare) {
-  // TODO(jacobr): alternately we could just copy the Array to JavaScript,
-  // invoke the JS sort method and then copy the result back to Dart.
-  Comparator compare;
-  if (rawCompare == null) {
-    compare = (a, b) => _toStringJs(a).compareTo(_toStringJs(b));
-  } else if (rawCompare is JsFunction) {
-    compare = (a, b) => rawCompare.apply([a, b]);
-  } else {
-    compare = rawCompare;
-  }
-  l.sort(compare);
-  return l;
-}
-// End of block of helper methods to emulate JavaScript Array methods on Dart List.
-
-/**
- * Can be called to provide a predictable point where no more JS interfaces can
- * be added. Creating an instance of JsObject will also automatically trigger
- * all JsObjects to be finalized.
- */
-@Deprecated("Internal Use Only")
-void finalizeJsInterfaces() {
-  if (_finalized == true) {
-    throw 'JSInterop class registration already finalized';
-  }
-  _finalizeJsInterfaces();
-}
-
-JsObject _cachedContext;
-
-JsObject get _context native "Js_context_Callback";
-
-bool get _finalized native "Js_interfacesFinalized_Callback";
-
-JsObject get context {
-  if (_cachedContext == null) {
-    _cachedContext = _context;
-  }
-  return _cachedContext;
-}
-
-_lookupType(o, bool isCrossFrame, bool isElement) {
-  try {
-    var type = html_common.lookupType(o, isElement);
-    var typeMirror = mirrors.reflectType(type);
-    var legacyInteropConvertToNative =
-        typeMirror.isSubtypeOf(mirrors.reflectType(html.Blob)) ||
-            typeMirror.isSubtypeOf(mirrors.reflectType(html.Event)) ||
-            typeMirror.isSubtypeOf(mirrors.reflectType(indexed_db.KeyRange)) ||
-            typeMirror.isSubtypeOf(mirrors.reflectType(html.ImageData)) ||
-            typeMirror.isSubtypeOf(mirrors.reflectType(html.Node)) ||
-//        TypedData is removed from this list as it is converted directly
-//        rather than flowing through the interceptor code path.
-//        typeMirror.isSubtypeOf(mirrors.reflectType(typed_data.TypedData)) ||
-            typeMirror.isSubtypeOf(mirrors.reflectType(html.Window));
-    if (isCrossFrame &&
-        !typeMirror.isSubtypeOf(mirrors.reflectType(html.Window))) {
-      // TODO(jacobr): evaluate using the true cross frame Window class, etc.
-      // as well as triggering that legacy JS Interop returns raw JsObject
-      // instances.
-      legacyInteropConvertToNative = false;
-    }
-    return [type, legacyInteropConvertToNative];
-  } catch (e) {}
-  return [JSObject.instanceRuntimeType, false];
-}
-
-/**
- * Base class for both the legacy JsObject class and the modern JSObject class.
- * This allows the JsNative utility class tobehave identically whether it is
- * called on a JsObject or a JSObject.
- */
-class _JSObjectBase extends NativeFieldWrapperClass2 {
-  String _toString() native "JSObject_toString";
-  _callMethod(String name, List args) native "JSObject_callMethod";
-  _operator_getter(String property) native "JSObject_[]";
-  _operator_setter(String property, value) native "JSObject_[]=";
-  bool _hasProperty(String property) native "JsObject_hasProperty";
-  bool _instanceof(/*JsFunction|JSFunction*/ type) native "JsObject_instanceof";
-
-  int get hashCode native "JSObject_hashCode";
-}
-
-/**
- * Proxies a JavaScript object to Dart.
- *
- * The properties of the JavaScript object are accessible via the `[]` and
- * `[]=` operators. Methods are callable via [callMethod].
- */
-class JsObject extends _JSObjectBase {
-  JsObject.internal();
-
-  /**
-   * Constructs a new JavaScript object from [constructor] and returns a proxy
-   * to it.
-   */
-  factory JsObject(JsFunction constructor, [List arguments]) {
-    try {
-      return _create(constructor, arguments);
-    } catch (e) {
-      // Re-throw any errors (returned as a string) as a DomException.
-      throw new html.DomException.jsInterop(e);
-    }
-  }
-
-  static JsObject _create(JsFunction constructor, arguments)
-      native "JsObject_constructorCallback";
-
-  /**
-   * Constructs a [JsObject] that proxies a native Dart object; _for expert use
-   * only_.
-   *
-   * Use this constructor only if you wish to get access to JavaScript
-   * properties attached to a browser host object, such as a Node or Blob, that
-   * is normally automatically converted into a native Dart object.
-   *
-   * An exception will be thrown if [object] either is `null` or has the type
-   * `bool`, `num`, or `String`.
-   */
-  factory JsObject.fromBrowserObject(object) {
-    if (object is num || object is String || object is bool || object == null) {
-      throw new ArgumentError("object cannot be a num, string, bool, or null");
-    }
-    if (object is JsObject) return object;
-    return _fromBrowserObject(object);
-  }
-
-  /**
-   * Recursively converts a JSON-like collection of Dart objects to a
-   * collection of JavaScript objects and returns a [JsObject] proxy to it.
-   *
-   * [object] must be a [Map] or [Iterable], the contents of which are also
-   * converted. Maps and Iterables are copied to a new JavaScript object.
-   * Primitives and other transferrable values are directly converted to their
-   * JavaScript type, and all other objects are proxied.
-   */
-  factory JsObject.jsify(object) {
-    if ((object is! Map) && (object is! Iterable)) {
-      throw new ArgumentError("object must be a Map or Iterable");
-    }
-    return _jsify(object);
-  }
-
-  static JsObject _jsify(object) native "JsObject_jsify";
-
-  static JsObject _fromBrowserObject(object)
-      native "JsObject_fromBrowserObject";
-
-  /**
-   * Returns the value associated with [property] from the proxied JavaScript
-   * object.
-   *
-   * The type of [property] must be either [String] or [num].
-   */
-  operator [](property) {
-    try {
-      return _operator_getterLegacy(property);
-    } catch (e) {
-      // Re-throw any errors (returned as a string) as a DomException.
-      throw new html.DomException.jsInterop(e);
-    }
-  }
-
-  _operator_getterLegacy(property) native "JsObject_[]Legacy";
-
-  /**
-   * Sets the value associated with [property] on the proxied JavaScript
-   * object.
-   *
-   * The type of [property] must be either [String] or [num].
-   */
-  operator []=(property, value) {
-    try {
-      _operator_setterLegacy(property, value);
-    } catch (e) {
-      // Re-throw any errors (returned as a string) as a DomException.
-      throw new html.DomException.jsInterop(e);
-    }
-  }
-
-  _operator_setterLegacy(property, value) native "JsObject_[]=Legacy";
-
-  int get hashCode native "JsObject_hashCode";
-
-  operator ==(other) {
-    if (other is! JsObject && other is! JSObject) return false;
-    return _identityEquality(this, other);
-  }
-
-  static bool _identityEquality(a, b) native "JsObject_identityEquality";
-
-  /**
-   * Returns `true` if the JavaScript object contains the specified property
-   * either directly or though its prototype chain.
-   *
-   * This is the equivalent of the `in` operator in JavaScript.
-   */
-  bool hasProperty(String property) => _hasProperty(property);
-
-  /**
-   * Removes [property] from the JavaScript object.
-   *
-   * This is the equivalent of the `delete` operator in JavaScript.
-   */
-  void deleteProperty(String property) native "JsObject_deleteProperty";
-
-  /**
-   * Returns `true` if the JavaScript object has [type] in its prototype chain.
-   *
-   * This is the equivalent of the `instanceof` operator in JavaScript.
-   */
-  bool instanceof(JsFunction type) => _instanceof(type);
-
-  /**
-   * Returns the result of the JavaScript objects `toString` method.
-   */
-  String toString() {
-    try {
-      return _toString();
-    } catch (e) {
-      return super.toString();
-    }
-  }
-
-  String _toString() native "JsObject_toString";
-
-  /**
-   * Calls [method] on the JavaScript object with the arguments [args] and
-   * returns the result.
-   *
-   * The type of [method] must be either [String] or [num].
-   */
-  callMethod(String method, [List args]) {
-    try {
-      return _callMethodLegacy(method, args);
-    } catch (e) {
-      if (hasProperty(method)) {
-        // Return a DomException if DOM call returned an error.
-        throw new html.DomException.jsInterop(e);
-      } else {
-        throw new NoSuchMethodError(this, new Symbol(method), args, null);
-      }
-    }
-  }
-
-  _callMethodLegacy(String name, List args) native "JsObject_callMethodLegacy";
-}
-
-/// Base class for all JS objects used through dart:html and typed JS interop.
-@Deprecated("Internal Use Only")
-class JSObject extends _JSObjectBase {
-  JSObject.internal() {}
-  external static Type get instanceRuntimeType;
-
-  /**
-   * Returns the result of the JavaScript objects `toString` method.
-   */
-  String toString() {
-    try {
-      return _toString();
-    } catch (e) {
-      return super.toString();
-    }
-  }
-
-  noSuchMethod(Invocation invocation) {
-    throwError() {
-      super.noSuchMethod(invocation);
-    }
-
-    String name = _stripReservedNamePrefix(
-        mirrors.MirrorSystem.getName(invocation.memberName));
-    argsSafeForTypedInterop(invocation.positionalArguments);
-    if (invocation.isGetter) {
-      if (CHECK_JS_INVOCATIONS) {
-        var matches = _allowedGetters[invocation.memberName];
-        if (matches == null &&
-            !_allowedMethods.containsKey(invocation.memberName)) {
-          throwError();
-        }
-        var ret = _operator_getter(name);
-        if (matches != null) return ret;
-        if (ret is Function ||
-            (ret is JsFunction /* shouldn't be needed in the future*/) &&
-                _allowedMethods.containsKey(invocation.memberName))
-          return ret; // Warning: we have not bound "this"... we could type check on the Function but that is of little value in Dart.
-        throwError();
-      } else {
-        // TODO(jacobr): should we throw if the JavaScript object doesn't have the property?
-        return _operator_getter(name);
-      }
-    } else if (invocation.isSetter) {
-      if (CHECK_JS_INVOCATIONS) {
-        var matches = _allowedSetters[invocation.memberName];
-        if (matches == null || !matches.checkInvocation(invocation))
-          throwError();
-      }
-      assert(name.endsWith("="));
-      name = name.substring(0, name.length - 1);
-      return _operator_setter(name, invocation.positionalArguments.first);
-    } else {
-      // TODO(jacobr): also allow calling getters that look like functions.
-      var matches;
-      if (CHECK_JS_INVOCATIONS) {
-        matches = _allowedMethods[invocation.memberName];
-        if (matches == null || !matches.checkInvocation(invocation))
-          throwError();
-      }
-      var ret = _callMethod(name, _buildArgs(invocation));
-      if (CHECK_JS_INVOCATIONS) {
-        if (!matches._checkReturnType(ret)) {
-          html.window.console.error("Return value for method: ${name} is "
-              "${ret.runtimeType} which is inconsistent with all typed "
-              "JS interop definitions for method ${name}.");
-        }
-      }
-      return ret;
-    }
-  }
-}
-
-@Deprecated("Internal Use Only")
-class JSArray extends JSObject with ListMixin {
-  JSArray.internal() : super.internal();
-  external static Type get instanceRuntimeType;
-
-  // Reuse JsArray_length as length behavior is unchanged.
-  int get length native "JsArray_length";
-
-  set length(int length) {
-    _operator_setter('length', length);
-  }
-
-  _checkIndex(int index, {bool insert: false}) {
-    int length = insert ? this.length + 1 : this.length;
-    if (index is int && (index < 0 || index >= length)) {
-      throw new RangeError.range(index, 0, length);
-    }
-  }
-
-  _checkRange(int start, int end) {
-    int cachedLength = this.length;
-    if (start < 0 || start > cachedLength) {
-      throw new RangeError.range(start, 0, cachedLength);
-    }
-    if (end < start || end > cachedLength) {
-      throw new RangeError.range(end, start, cachedLength);
-    }
-  }
-
-  _indexed_getter(int index) native "JSArray_indexed_getter";
-  _indexed_setter(int index, o) native "JSArray_indexed_setter";
-
-  // Methods required by ListMixin
-
-  operator [](index) {
-    if (index is int) {
-      _checkIndex(index);
-    }
-
-    return _indexed_getter(index);
-  }
-
-  void operator []=(int index, value) {
-    _checkIndex(index);
-    _indexed_setter(index, value);
-  }
-}
-
-@Deprecated("Internal Use Only")
-class JSFunction extends JSObject implements Function {
-  JSFunction.internal() : super.internal();
-
-  external static Type get instanceRuntimeType;
-
-  call(
-      [a1 = _UNDEFINED,
-      a2 = _UNDEFINED,
-      a3 = _UNDEFINED,
-      a4 = _UNDEFINED,
-      a5 = _UNDEFINED,
-      a6 = _UNDEFINED,
-      a7 = _UNDEFINED,
-      a8 = _UNDEFINED,
-      a9 = _UNDEFINED,
-      a10 = _UNDEFINED]) {
-    return _apply(
-        _stripUndefinedArgs([a1, a2, a3, a4, a5, a6, a7, a8, a9, a10]));
-  }
-
-  noSuchMethod(Invocation invocation) {
-    if (invocation.isMethod && invocation.memberName == #call) {
-      return _apply(_buildArgs(invocation));
-    }
-    return super.noSuchMethod(invocation);
-  }
-
-  dynamic _apply(List args, {thisArg}) native "JSFunction_apply";
-
-  static JSFunction _createWithThis(Function f)
-      native "JSFunction_createWithThis";
-  static JSFunction _create(Function f) native "JSFunction_create";
-}
-
-// JavaScript interop methods that do not automatically wrap to dart:html types.
-// Warning: this API is not exposed to dart:js.
-// TODO(jacobr): rename to JSNative and make at least part of this API public.
-@Deprecated("Internal Use Only")
-class JsNative {
-  static JSObject jsify(object) native "JSObject_jsify";
-  static JSObject newObject() native "JSObject_newObject";
-  static JSArray newArray() native "JSObject_newArray";
-
-  static hasProperty(_JSObjectBase o, name) => o._hasProperty(name);
-  static getProperty(_JSObjectBase o, name) => o._operator_getter(name);
-  static setProperty(_JSObjectBase o, name, value) =>
-      o._operator_setter(name, value);
-  static callMethod(_JSObjectBase o, String method, List args) =>
-      o._callMethod(method, args);
-  static instanceof(_JSObjectBase o, /*JsFunction|JSFunction*/ type) =>
-      o._instanceof(type);
-  static callConstructor0(_JSObjectBase constructor)
-      native "JSNative_callConstructor0";
-  static callConstructor(_JSObjectBase constructor, List args)
-      native "JSNative_callConstructor";
-
-  static toTypedObject(JsObject o) native "JSNative_toTypedObject";
-
-  /**
-   * Same behavior as new JsFunction.withThis except that JavaScript "this" is not
-   * wrapped.
-   */
-  static JSFunction withThis(Function f) native "JsFunction_withThisNoWrap";
-}
-
-/**
- * Proxies a JavaScript Function object.
- */
-class JsFunction extends JsObject {
-  JsFunction.internal() : super.internal();
-
-  /**
-   * Returns a [JsFunction] that captures its 'this' binding and calls [f]
-   * with the value of this passed as the first argument.
-   */
-  factory JsFunction.withThis(Function f) => _withThis(f);
-
-  /**
-   * Invokes the JavaScript function with arguments [args]. If [thisArg] is
-   * supplied it is the value of `this` for the invocation.
-   */
-  dynamic apply(List args, {thisArg}) => _apply(args, thisArg: thisArg);
-
-  dynamic _apply(List args, {thisArg}) native "JsFunction_apply";
-
-  /**
-   * Internal only version of apply which uses debugger proxies of Dart objects
-   * rather than opaque handles. This method is private because it cannot be
-   * efficiently implemented in Dart2Js so should only be used by internal
-   * tools.
-   */
-  _applyDebuggerOnly(List args, {thisArg})
-      native "JsFunction_applyDebuggerOnly";
-
-  static JsFunction _withThis(Function f) native "JsFunction_withThis";
-}
-
-/**
- * A [List] proxying a JavaScript Array.
- */
-class JsArray<E> extends JsObject with ListMixin<E> {
-  JsArray.internal() : super.internal();
-
-  factory JsArray() => _newJsArray();
-
-  static JsArray _newJsArray() native "JsArray_newJsArray";
-
-  factory JsArray.from(Iterable<E> other) =>
-      _newJsArrayFromSafeList(new List.from(other));
-
-  static JsArray _newJsArrayFromSafeList(List list)
-      native "JsArray_newJsArrayFromSafeList";
-
-  _checkIndex(int index, {bool insert: false}) {
-    int length = insert ? this.length + 1 : this.length;
-    if (index is int && (index < 0 || index >= length)) {
-      throw new RangeError.range(index, 0, length);
-    }
-  }
-
-  _checkRange(int start, int end) {
-    int cachedLength = this.length;
-    if (start < 0 || start > cachedLength) {
-      throw new RangeError.range(start, 0, cachedLength);
-    }
-    if (end < start || end > cachedLength) {
-      throw new RangeError.range(end, start, cachedLength);
-    }
-  }
-
-  // Methods required by ListMixin
-
-  E operator [](index) {
-    if (index is int) {
-      _checkIndex(index);
-    }
-
-    return super[index];
-  }
-
-  void operator []=(index, E value) {
-    if (index is int) {
-      _checkIndex(index);
-    }
-    super[index] = value;
-  }
-
-  int get length native "JsArray_length";
-
-  set length(int length) {
-    super['length'] = length;
-  }
-
-  // Methods overridden for better performance
-
-  void add(E value) {
-    callMethod('push', [value]);
-  }
-
-  void addAll(Iterable<E> iterable) {
-    // TODO(jacobr): this can be optimized slightly.
-    callMethod('push', new List.from(iterable));
-  }
-
-  void insert(int index, E element) {
-    _checkIndex(index, insert: true);
-    callMethod('splice', [index, 0, element]);
-  }
-
-  E removeAt(int index) {
-    _checkIndex(index);
-    return callMethod('splice', [index, 1])[0];
-  }
-
-  E removeLast() {
-    if (length == 0) throw new RangeError(-1);
-    return callMethod('pop');
-  }
-
-  void removeRange(int start, int end) {
-    _checkRange(start, end);
-    callMethod('splice', [start, end - start]);
-  }
-
-  void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]) {
-    _checkRange(start, end);
-    int length = end - start;
-    if (length == 0) return;
-    if (skipCount < 0) throw new ArgumentError(skipCount);
-    var args = [start, length]..addAll(iterable.skip(skipCount).take(length));
-    callMethod('splice', args);
-  }
-
-  void sort([int compare(E a, E b)]) {
-    callMethod('sort', [compare]);
-  }
-}
-
-/**
- * Placeholder object for cases where we need to determine exactly how many
- * args were passed to a function.
- */
-const _UNDEFINED = const Object();
-
-// TODO(jacobr): this method is a hack to work around the lack of proper dart
-// support for varargs methods.
-List _stripUndefinedArgs(List args) =>
-    args.takeWhile((i) => i != _UNDEFINED).toList();
-
-/**
- * Check that that if [arg] is a [Function] it is safe to pass to JavaScript.
- * To make a function safe, call [allowInterop] or [allowInteropCaptureThis].
- */
-@Deprecated("Internal Use Only")
-safeForTypedInterop(arg) {
-  if (CHECK_JS_INVOCATIONS && arg is Function && arg is! JSFunction) {
-    throw new ArgumentError(
-        "Attempt to pass Function '$arg' to JavaScript via without calling allowInterop or allowInteropCaptureThis");
-  }
-}
-
-/**
- * Check that that if any elements of [args] are [Function] it is safe to pass
- * to JavaScript. To make a function safe, call [allowInterop] or
- * [allowInteropCaptureThis].
- */
-@Deprecated("Internal Use Only")
-void argsSafeForTypedInterop(Iterable args) {
-  for (var arg in args) {
-    safeForTypedInterop(arg);
-  }
-}
-
-/**
- * Returns a method that can be called with an arbitrary number (for n less
- * than 11) of arguments without violating Dart type checks.
- */
-Function _wrapAsDebuggerVarArgsFunction(JsFunction jsFunction) => (
-        [a1 = _UNDEFINED,
-        a2 = _UNDEFINED,
-        a3 = _UNDEFINED,
-        a4 = _UNDEFINED,
-        a5 = _UNDEFINED,
-        a6 = _UNDEFINED,
-        a7 = _UNDEFINED,
-        a8 = _UNDEFINED,
-        a9 = _UNDEFINED,
-        a10 = _UNDEFINED]) =>
-    jsFunction._applyDebuggerOnly(
-        _stripUndefinedArgs([a1, a2, a3, a4, a5, a6, a7, a8, a9, a10]));
-
-/// Returns a wrapper around function [f] that can be called from JavaScript
-/// using the package:js Dart-JavaScript interop.
-///
-/// For performance reasons in Dart2Js, by default Dart functions cannot be
-/// passed directly to JavaScript unless this method is called to create
-/// a Function compatible with both Dart and JavaScript.
-/// Calling this method repeatedly on a function will return the same function.
-/// The [Function] returned by this method can be used from both Dart and
-/// JavaScript. We may remove the need to call this method completely in the
-/// future if Dart2Js is refactored so that its function calling conventions
-/// are more compatible with JavaScript.
-Function/*=F*/ allowInterop/*<F extends Function>*/(Function/*=F*/ f) {
-  if (f is JSFunction) {
-    // The function is already a JSFunction... no need to do anything.
-    return f;
-  } else {
-    return JSFunction._create(f);
-  }
-}
-
-/// Cached JSFunction associated with the Dart function when "this" is
-/// captured.
-Expando<JSFunction> _interopCaptureThisExpando = new Expando<JSFunction>();
-
-/// Returns a [Function] that when called from JavaScript captures its 'this'
-/// binding and calls [f] with the value of this passed as the first argument.
-/// When called from Dart, [null] will be passed as the first argument.
-///
-/// See the documentation for [allowInterop]. This method should only be used
-/// with package:js Dart-JavaScript interop.
-JSFunction allowInteropCaptureThis(Function f) {
-  if (f is JSFunction) {
-    // Behavior when the function is already a JS function is unspecified.
-    throw new ArgumentError(
-        "Function is already a JS function so cannot capture this.");
-    return f;
-  } else {
-    var ret = _interopCaptureThisExpando[f];
-    if (ret == null) {
-      // TODO(jacobr): we could optimize this.
-      ret = JSFunction._createWithThis(f);
-      _interopCaptureThisExpando[f] = ret;
-    }
-    return ret;
-  }
-}