Move codegen registration to transformImpact method.

pkg/compiler/lib/src/js_backend/js_backend.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.
 
 library js_backend;
 
 import 'dart:async' show EventSink, Future;
 import 'dart:collection' show HashMap;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 import 'package:js_runtime/shared/embedded_names.dart' show JsGetName;
 
 import '../closure.dart';
 import '../common.dart';
 import '../common/backend_api.dart' show
     Backend,
+    ImpactTransformer,
     ForeignResolver;
 import '../common/codegen.dart' show
+    CodegenImpact,
     CodegenRegistry,
     CodegenWorkItem;
 import '../common/names.dart' show
     Identifiers,
     Selectors,
     Uris;
 import '../common/registry.dart' show
+    EagerRegistry,
     Registry;
 import '../common/tasks.dart' show
     CompilerTask;
 import '../common/resolution.dart' show
     Feature,
     ListLiteralUse,
     MapLiteralUse,
     Resolution,
-    ResolutionCallbacks,
-    ResolutionImpact,
-    TransformedWorldImpact;
+    ResolutionImpact;
 import '../common/work.dart' show
     ItemCompilationContext;
 import '../compiler.dart' show
     Compiler;
 import '../compile_time_constants.dart';
 import '../constants/constant_system.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
@@ skipping 16 matching lines @@
     JavaScriptSourceInformationStrategy;
 import '../js/rewrite_async.dart';
 import '../js_emitter/js_emitter.dart' show
     CodeEmitterTask,
     Emitter,
     MetadataCollector,
     Placeholder,
     USE_LAZY_EMITTER;
 import '../library_loader.dart' show LibraryLoader, LoadedLibraries;
 import '../native/native.dart' as native;
-import '../patch_parser.dart' show
-    checkJsInteropAnnotation;
-import '../resolution/registry.dart' show
-    EagerRegistry;
 import '../resolution/tree_elements.dart' show
     TreeElements;
 import '../ssa/ssa.dart';
 import '../tree/tree.dart';
 import '../types/types.dart';
 import '../universe/call_structure.dart' show
     CallStructure;
 import '../universe/selector.dart' show
     Selector,
     SelectorKind;
 import '../universe/universe.dart';
 import '../universe/world_impact.dart' show
+    TransformedWorldImpact,
     WorldImpact;
 import '../util/characters.dart';
 import '../util/util.dart';
 import '../world.dart' show
     ClassWorld;
 
 import 'backend_helpers.dart';
 import 'backend_impact.dart';
 import 'codegen/task.dart';
 import 'constant_system_javascript.dart';
 import 'patch_resolver.dart';
 import 'js_interop_analysis.dart' show JsInteropAnalysis;
 import 'lookup_map_analysis.dart' show LookupMapAnalysis;
 
 part 'backend.dart';
 part 'checked_mode_helpers.dart';
 part 'constant_emitter.dart';
 part 'constant_handler_javascript.dart';
 part 'custom_elements_analysis.dart';
 part 'frequency_namer.dart';
 part 'field_naming_mixin.dart';
 part 'minify_namer.dart';
 part 'namer.dart';
 part 'namer_names.dart';
 part 'no_such_method_registry.dart';
 part 'runtime_types.dart';
 part 'type_variable_handler.dart';