Start new design for interceptors and implement String.charCodeAt with it.

sdk/lib/_internal/compiler/implementation/js_backend/emitter_no_eval.dart

 // 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.
 
 part of js_backend;
 
 class CodeEmitterNoEvalTask extends CodeEmitterTask {
   CodeEmitterNoEvalTask(Compiler compiler,
                         Namer namer,
                         bool generateSourceMap)
@@ skipping 43 matching lines @@
   }
   Isolate.prototype = oldIsolate.prototype;
   Isolate.prototype.constructor = Isolate;
   Isolate.${namer.ISOLATE_PROPERTIES} = isolateProperties;
   return Isolate;
 }""";
   }
 
   void emitBoundClosureClassHeader(String mangledName,
                                    String superName,
+                                   String extraArgument,
                                    CodeBuffer buffer) {
-    buffer.add("""
+    if (!extraArgument.isEmpty) {
+      buffer.add("""
+$classesCollector.$mangledName = {'': function $mangledName(
+    self, $extraArgument, target) {
+  this.self = self;
+  this.$extraArgument = $extraArgument,
+  this.target = target;
+ },
+ 'super': '$superName',
+""");
+    } else {
+      buffer.add("""
 $classesCollector.$mangledName = {'': function $mangledName(self, target) {
   this.self = self;
   this.target = target;
  },
  'super': '$superName',
 """);
+    }
   }
 
   void emitClassConstructor(ClassElement classElement, CodeBuffer buffer) {
     // Say we have a class A with fields b, c and d, where c needs a getter and
     // d needs both a getter and a setter. Then we produce:
     // - a constructor (directly into the given [buffer]):
     //   function A(b, c, d) { this.b = b, this.c = c, this.d = d; }
     // - getters and setters (stored in the [explicitGettersSetters] list):
     //   get$c : function() { return this.c; }
     //   get$d : function() { return this.d; }
@@ skipping 53 matching lines @@
         generateSetter(member, name, buffer);
       }
       if (needsCheckedSetter) {
         assert(!needsSetter);
         emitComma();
         generateCheckedSetter(member, name, buffer);
       }
     });
   }
 }