Protobuf changes for smaller dart2js code, Int64 fixes

lib/src/plugin.pb.dart

 ///
 //  Generated code. Do not modify.
 ///
 library proto2.compiler;
 
 import 'package:fixnum/fixnum.dart';
 import 'package:protobuf/protobuf.dart';
-import 'descriptor.pb.dart';
+import 'descriptor.pb.dart' as proto2;
 
 class CodeGeneratorRequest extends GeneratedMessage {
   static final BuilderInfo _i = new BuilderInfo('CodeGeneratorRequest')
     ..p(1, 'fileToGenerate', GeneratedMessage.PS)
     ..a(2, 'parameter', GeneratedMessage.OS)
-    ..m(15, 'protoFile', () => new FileDescriptorProto(), () => new PbList<FileDescriptorProto>())
-    ..hasRequiredFields = false
+    ..m(15, 'protoFile', proto2.FileDescriptorProto.create, proto2.FileDescriptorProto.createRepeated)
   ;
 
   CodeGeneratorRequest() : super();
   CodeGeneratorRequest.fromBuffer(List<int> i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromBuffer(i, r);
   CodeGeneratorRequest.fromJson(String i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromJson(i, r);
   CodeGeneratorRequest clone() => new CodeGeneratorRequest()..mergeFromMessage(this);
   BuilderInfo get info_ => _i;
+  static CodeGeneratorRequest create() => new CodeGeneratorRequest();
+  static PbList<CodeGeneratorRequest> createRepeated() => new PbList<CodeGeneratorRequest>();
 
   List<String> get fileToGenerate => getField(1);
 
   String get parameter => getField(2);
   void set parameter(String v) { setField(2, v); }
   bool hasParameter() => hasField(2);
   void clearParameter() => clearField(2);
 
-  List<FileDescriptorProto> get protoFile => getField(15);
+  List<proto2.FileDescriptorProto> get protoFile => getField(15);
 }
 
 class CodeGeneratorResponse_File extends GeneratedMessage {
   static final BuilderInfo _i = new BuilderInfo('CodeGeneratorResponse_File')
     ..a(1, 'name', GeneratedMessage.OS)
     ..a(2, 'insertionPoint', GeneratedMessage.OS)
     ..a(15, 'content', GeneratedMessage.OS)
     ..hasRequiredFields = false
   ;
 
   CodeGeneratorResponse_File() : super();
   CodeGeneratorResponse_File.fromBuffer(List<int> i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromBuffer(i, r);
   CodeGeneratorResponse_File.fromJson(String i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromJson(i, r);
   CodeGeneratorResponse_File clone() => new CodeGeneratorResponse_File()..mergeFromMessage(this);
   BuilderInfo get info_ => _i;
+  static CodeGeneratorResponse_File create() => new CodeGeneratorResponse_File();
+  static PbList<CodeGeneratorResponse_File> createRepeated() => new PbList<CodeGeneratorResponse_File>();
 
   String get name => getField(1);
   void set name(String v) { setField(1, v); }
   bool hasName() => hasField(1);
   void clearName() => clearField(1);
 
   String get insertionPoint => getField(2);
   void set insertionPoint(String v) { setField(2, v); }
   bool hasInsertionPoint() => hasField(2);
   void clearInsertionPoint() => clearField(2);
 
   String get content => getField(15);
   void set content(String v) { setField(15, v); }
   bool hasContent() => hasField(15);
   void clearContent() => clearField(15);
 }
 
 class CodeGeneratorResponse extends GeneratedMessage {
   static final BuilderInfo _i = new BuilderInfo('CodeGeneratorResponse')
     ..a(1, 'error', GeneratedMessage.OS)
-    ..m(15, 'file', () => new CodeGeneratorResponse_File(), () => new PbList<CodeGeneratorResponse_File>())
+    ..m(15, 'file', CodeGeneratorResponse_File.create, CodeGeneratorResponse_File.createRepeated)
     ..hasRequiredFields = false
   ;
 
   CodeGeneratorResponse() : super();
   CodeGeneratorResponse.fromBuffer(List<int> i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromBuffer(i, r);
   CodeGeneratorResponse.fromJson(String i, [ExtensionRegistry r = ExtensionRegistry.EMPTY]) : super.fromJson(i, r);
   CodeGeneratorResponse clone() => new CodeGeneratorResponse()..mergeFromMessage(this);
   BuilderInfo get info_ => _i;
+  static CodeGeneratorResponse create() => new CodeGeneratorResponse();
+  static PbList<CodeGeneratorResponse> createRepeated() => new PbList<CodeGeneratorResponse>();
 
   String get error => getField(1);
   void set error(String v) { setField(1, v); }
   bool hasError() => hasField(1);
   void clearError() => clearField(1);
 
   List<CodeGeneratorResponse_File> get file => getField(15);
 }