dart2js cps: Use 'this' instead of receiver when possible.

pkg/compiler/lib/src/js_backend/codegen/glue.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.
 
 library code_generator_dependencies;
 
 import '../js_backend.dart';
 import '../../common/registry.dart' show
     Registry;
 import '../../compiler.dart' show
@@ skipping 36 matching lines @@
   ClassWorld get classWorld => _compiler.world;
 
   js.Expression constantReference(ConstantValue value) {
     return _emitter.constantReference(value);
   }
 
   reportInternalError(String message) {
     _compiler.internalError(_compiler.currentElement, message);
   }
 
+  bool isUsedAsMixin(ClassElement clazz) {

[sra1, 2015/08/26 15:04:43]

nit: I'm not a fan of the non-word 'clazz'.
Other places in the compiler use 'element' or 'classElement'.
I'd prefer the CPS files were consistent.

+    return classWorld.isUsedAsMixin(clazz);
+  }
+
   ConstantValue getConstantValueForVariable(VariableElement variable) {
     return _backend.constants.getConstantValueForVariable(variable);
   }
 
   js.Expression staticFunctionAccess(FunctionElement element) {
     return _backend.emitter.staticFunctionAccess(element);
   }
 
   js.Expression isolateStaticClosureAccess(FunctionElement element) {
     return _backend.emitter.isolateStaticClosureAccess(element);
@@ skipping 40 matching lines @@
   }
 
   bool isInterceptedSelector(Selector selector) {
     return _backend.isInterceptedSelector(selector);
   }
 
   bool isInterceptedMethod(Element element) {
     return _backend.isInterceptedMethod(element);
   }
 
+  bool isInterceptorClass(ClassElement element) {
+    return element.isSubclassOf(_backend.jsInterceptorClass);
+  }
+
   Set<ClassElement> getInterceptedClassesOn(Selector selector) {
     return _backend.getInterceptedClassesOn(selector.name);
   }
 
   void registerSpecializedGetInterceptor(Set<ClassElement> classes) {
     _backend.registerSpecializedGetInterceptor(classes);
   }
 
   js.Expression constructorAccess(ClassElement element) {
     return _backend.emitter.constructorAccess(element);
@@ skipping 127 matching lines @@
   ClassElement get jsMutableArrayClass => _backend.jsMutableArrayClass;
 
   bool isStringClass(ClassElement classElement) =>
       classElement == _backend.jsStringClass ||
       classElement == _compiler.stringClass;
 
   bool isBoolClass(ClassElement classElement) =>
       classElement == _backend.jsBoolClass ||
       classElement == _compiler.boolClass;
 }