Big merge from experimental to bleeding edge.

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

Index: sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
index d8407c386f6d6b60210fe363fb9653a00e5c5eee..0bc0bc8eabb95d76cc22608746329d5f1706391d 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
@@ -161,7 +161,7 @@ function(cls, desc) {
         compiler.findHelper(const SourceString('convertDartClosureToJS'));
     String closureConverter = backend.namer.isolateAccess(converter);
     Set<String> stubParameterNames = new Set<String>.from(
-        stubParameters.map((param) => param.name));
+        stubParameters.mappedBy((param) => param.name));
     parameters.forEachParameter((Element parameter) {
       String name = parameter.name.slowToString();
       // If [name] is not in [stubParameters], then the parameter is an optional
@@ -255,7 +255,7 @@ function(cls, desc) {
             js.use('Object').dot('prototype').dot(methodName).dot('call')
             .callWith(
                 <js.Expression>[js.use('this')]..addAll(
-                    parameters.map((param) => js.use(param.name))))));
+                    parameters.mappedBy((param) => js.use(param.name))))));
   }
 
   js.Block generateMethodBodyWithPrototypeCheckForElement(
@@ -298,14 +298,14 @@ function(cls, desc) {
     }
     classesWithDynamicDispatch.forEach(visit);
 
-    Collection<ClassElement> preorderDispatchClasses = classes.filter(
+    List<ClassElement> preorderDispatchClasses = classes.where(
         (cls) => !getDirectSubclasses(cls).isEmpty &&
-                  classesWithDynamicDispatch.contains(cls));
+                  classesWithDynamicDispatch.contains(cls)).toList();
 
     if (!compiler.enableMinification) {
       nativeBuffer.add('// ${classes.length} classes\n');
     }
-    Collection<ClassElement> classesThatHaveSubclasses = classes.filter(
+    Iterable<ClassElement> classesThatHaveSubclasses = classes.where(
         (ClassElement t) => !getDirectSubclasses(t).isEmpty);
     if (!compiler.enableMinification) {
       nativeBuffer.add('// ${classesThatHaveSubclasses.length} !leaf\n');
@@ -411,7 +411,7 @@ function(cls, desc) {
       //   [['Node', 'Text|HTMLElement|HTMLDivElement|...'], ...]
       js.Expression table =
           new js.ArrayInitializer.from(
-              preorderDispatchClasses.map((cls) =>
+              preorderDispatchClasses.mappedBy((cls) =>
                   new js.ArrayInitializer.from([
                       js.string(toNativeTag(cls)),
                       tagDefns[cls]])));