dart2js: add classNameFromIsCheckProperty to compiler builtins.

sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart

 // Copyright (c) 2014, 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.
 
 /// Contains the names of globals that are embedded into the output by the
 /// compiler.
 ///
 /// Variables embedded this way should be access with `JS_EMBEDDED_GLOBAL` from
 /// the `_foreign_helper` library.
 ///
@@ skipping 71 matching lines @@
   CALL_CATCH_ALL,
   REFLECTABLE,
   CLASS_DESCRIPTOR_PROPERTY,
   REQUIRED_PARAMETER_PROPERTY,
   DEFAULT_VALUES_PROPERTY,
   CALL_NAME_PROPERTY,
   DEFERRED_ACTION_PROPERTY
 }
 
 enum JsBuiltin {
-   /// Returns the JavaScript constructor function for Dart's Object class.
-   /// This can be used for type tests, as in
-   ///
-   ///     var constructor = JS_BUILTIN('', JsBuiltin.dartObjectContructor);
-   ///     if (JS('bool', '# instanceof #', obj, constructor))
-   ///       ...
+  /// Returns the JavaScript constructor function for Dart's Object class.
+  /// This can be used for type tests, as in
+  ///
+  ///     var constructor = JS_BUILTIN('', JsBuiltin.dartObjectContructor);
+  ///     if (JS('bool', '# instanceof #', obj, constructor))
+  ///       ...
   dartObjectConstructor,
 
+  /// Returns the class name given an [isCheckProperty].
+  ///
+  /// This relies on a deterministic encoding of is-check properties (for
+  /// example `$isFoo` for a class `Foo`). In minified code the returned
+  /// classname is the minified name of the class.
+  ///
+  ///     JS_BUILTIN('returns:String;depends:none;effects:none',
+  ///                JsBuiltin.classNameFromIsCheckProperty,
+  ///                isCheckProperty);
+  classNameFromIsCheckProperty,
+
   /// Returns true if the given type is a function type. Returns false for
   /// the one `Function` type singleton. (See [isFunctionTypeSingleton]).
   ///
   ///     JS_BUILTIN('bool', JsBuiltin.isFunctionType, o)
   isFunctionType,
 
   /// Returns true if the given type is the `Function` type literal.
   ///
   ///     JS_BUILTIN('returns:bool;effects:none;depends:none',
   ///                JsBuiltin.isFunctionTypeLiteral, type);
   isFunctionTypeLiteral,
 
   /// Returns a new function type object.
   ///
   ///     JS_BUILTIN('=Object', JsBuiltin.createFunctionType)
   createFunctionType,
 
   /// Returns the class name of the given type.
   ///
   ///     JS_BUILTIN('String', JsBuiltin.typeName, type)
   typeName,
 
   /// Returns the raw runtime type of the given object. The given argument
   /// [o] should be the interceptor (for non-Dart objects).
   ///
   ///     JS_BUILTIN('', JsBuiltin.rawRuntimeType, o)
   rawRuntimeType,
 }