Split js interop registration into library/class/member elements

pkg/compiler/lib/src/js_backend/minify_namer.dart

 // Copyright (c) 2011, 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.namer;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class MinifyNamer extends Namer
@@ skipping 274 matching lines @@
   }
 
   int _alphaNumericNumber(int x) {
     if (x >= ALPHANUMERIC_CHARACTERS) x %= ALPHANUMERIC_CHARACTERS;
     if (x < 26) return $a + x;
     if (x < 52) return $A + x - 26;
     return $0 + x - 52;
   }
 
   @override
-  jsAst.Name instanceFieldPropertyName(Element element) {
+  jsAst.Name instanceFieldPropertyName(FieldElement element) {
     jsAst.Name proposed = _minifiedInstanceFieldPropertyName(element);
     if (proposed != null) {
       return proposed;
     }
     return super.instanceFieldPropertyName(element);
   }
 }
 
 /// Implements naming for constructor bodies.
 ///
@@ skipping 75 matching lines @@
     String prefix =
         selector.isGetter ? r"$get" : selector.isSetter ? r"$set" : "";
     String callSuffix = selector.isCall
         ? callSuffixForStructure(selector.callStructure).join()
         : "";
     String suffix = suffixForGetInterceptor(classes);
     String fullName = "\$intercepted$prefix\$$root$callSuffix\$$suffix";
     return _disambiguateInternalGlobal(fullName);
   }
 }