Split js interop registration into library/class/member elements

pkg/compiler/lib/src/js_emitter/native_emitter.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 dart2js.js_emitter.native_emitter;
 
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../elements/types.dart' show DartType, FunctionType;
 import '../elements/entities.dart';
@@ skipping 321 matching lines @@
       arguments = argumentsBuffer.sublist(
           0, indexOfLastOptionalArgumentInParameters + 1);
       if (nativeData.isJsInteropMember(member)) {
         // fixedBackendPath is allowed to have the form foo.bar.baz for
         // interop. This template is uncached to avoid possibly running out of
         // memory when Dart2Js is run in server mode. In reality the risk of
         // caching these templates causing an issue  is very low as each class
         // and library that uses typed JavaScript interop will create only 1
         // unique template.
         receiver = js
-            .uncachedExpressionTemplate(namer.fixedBackendMethodPath(member))
+            .uncachedExpressionTemplate(
+                nativeData.getFixedBackendMethodPath(member))
             .instantiate([]);
       } else {
         receiver = js('this');
       }
     }
     statements
         .add(js.statement('return #.#(#)', [receiver, target, arguments]));
 
     return statements;
   }
@@ skipping 11 matching lines @@
     // satisfy a check against [element], in which case an interceptor must be
     // used.  We should also use an interceptor if the check can't be satisfied
     // by a native class in case we get a native instance that tries to spoof
     // the type info.  i.e the criteria for whether or not to use an interceptor
     // is whether the receiver can be native, not the type of the test.
     ClassEntity cls = element;
     if (nativeData.isNativeOrExtendsNative(cls)) return true;
     return isSupertypeOfNativeClass(element);
   }
 }