Protobuf changes for smaller dart2js code, Int64 fixes

test/message_generator_test.dart

 #!/usr/bin/env dart
 // Copyright (c) 2013, 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 message_generator_test;
 
 import 'package:protoc_plugin/src/descriptor.pb.dart';
 import 'package:protoc_plugin/src/plugin.pb.dart';
 import 'package:protoc_plugin/protoc.dart';
@@ skipping 18 matching lines @@
 
   static final Map<int, PhoneNumber_PhoneType> _byValue = ProtobufEnum.initByValue(values);
   static PhoneNumber_PhoneType valueOf(int value) => _byValue[value];
 
   const PhoneNumber_PhoneType._(int v, String n) : super(v, n);
 }
 
 class PhoneNumber extends GeneratedMessage {
   static final BuilderInfo _i = new BuilderInfo('PhoneNumber')
     ..a(1, 'number', GeneratedMessage.QS)
-    ..e(2, 'type', GeneratedMessage.OE, () => PhoneNumber_PhoneType.MOBILE, (var v) => PhoneNumber_PhoneType.valueOf(v))
-    ..a(3, 'name', GeneratedMessage.OS, () => '\$')
+    ..e(2, 'type', GeneratedMessage.OE, PhoneNumber_PhoneType.MOBILE, (var v) => PhoneNumber_PhoneType.valueOf(v))
+    ..a(3, 'name', GeneratedMessage.OS, '\$')
   ;
 
   PhoneNumber() : super();
   PhoneNumber.fromBuffer(List<int> i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromBuffer(i, r);
   PhoneNumber.fromJson(String i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromJson(i, r);
   PhoneNumber clone() => new PhoneNumber()..mergeFromMessage(this);
   BuilderInfo get info_ => _i;
+  static PhoneNumber create() => new PhoneNumber();
+  static PbList<PhoneNumber> createRepeated() => new PbList<PhoneNumber>();
 
   String get number => getField(1);
   void set number(String v) { setField(1, v); }
   bool hasNumber() => hasField(1);
   void clearNumber() => clearField(1);
 
   PhoneNumber_PhoneType get type => getField(2);
   void set type(PhoneNumber_PhoneType v) { setField(2, v); }
   bool hasType() => hasField(2);
   void clearType() => clearField(2);
@@ skipping 51 matching lines @@
         new CodeGeneratorRequest(), new CodeGeneratorResponse());
     var context = new GenerationContext(options,
         new DefaultOutputConfiguration());
     FileGenerator fg = new FileGenerator(fd, null, context);
     MessageGenerator mg = new MessageGenerator(md, fg, context);
     mg.initializeFields();
     mg.generate(writer);
     expect(buffer.toString(), expected);
   });
 }