feat(change_detector): add support for formatters

modules/change_detection/src/record.js

@@ -16,6 +16,7 @@ export const PROTO_RECORD_PROPERTY = 'property';
 export class ProtoRecord {
   @FIELD('final watchGroup:wg.ProtoWatchGroup')
   @FIELD('final context:Object')
+  @FIELD('final funcOrValue:Object')
   @FIELD('final arity:int')
   @FIELD('final dest')
 

modules/change_detection/src/watch_group.js

@@ -1,12 +1,14 @@
 import {ProtoRecord, Record, PROTO_RECORD_CONST, PROTO_RECORD_FUNC, PROTO_RECORD_PROPERTY} from './record';
 import {FIELD, IMPLEMENTS, isBlank, isPresent, int, toBool, autoConvertAdd, BaseException} from 'facade/lang';
 import {ListWrapper} from 'facade/collection';
-import {AST, AccessMember, ImplicitReceiver, AstVisitor, LiteralPrimitive, Binary} from './parser/ast';
+import {AST, AccessMember, ImplicitReceiver, AstVisitor, LiteralPrimitive, Binary, Formatter} from './parser/ast';
 
 export class ProtoWatchGroup {
   @FIELD('headRecord:ProtoRecord')
   @FIELD('tailRecord:ProtoRecord')
-  constructor() {
+  constructor(formatters) {
+    this.formatters = formatters;
+
     this.headRecord = null;
     this.tailRecord = null;
   }
@@ -179,6 +181,15 @@ class ProtoRecordCreator {
     this.add(record);
   }
 
+  visitFormatter(ast:Formatter, dest) {
+    var formatter = this.protoWatchGroup.formatters[ast.name];
+    var record = this.construct(PROTO_RECORD_FUNC, formatter, ast.allArgs.length, dest);
+    for (var i = 0; i < ast.allArgs.length; ++i) {
+      ast.allArgs[i].visit(this, new Destination(record, i));
+    }
+    this.add(record);
+  }
+
   createRecordsFromAST(ast:AST, memento){
     ast.visit(this, memento);
   }