Sync changes from internal repo. (flutter#86)

* Fix type in PbList.fold() for Dart 2.
* Small performance tweaks for DDC.

Fixes #84.
Fixes #85.

lib/meta.dart

@@ -51,6 +51,7 @@ const List<String> GeneratedMessage_reservedNames = const [
   'clone',
   r'$_get',
   r'$_getI64',
+  r'$_getList',
   r'$_getN',
   r'$_getS',
   r'$_has',

lib/mixins_meta.dart

@@ -74,15 +74,23 @@ const List<String> _reservedNamesForMap = const [
   '[]',
   '[]=',
   'addAll',
+  'addEntries',
+  'cast',
   'containsKey',
   'containsValue',
+  'entries',
   'forEach',
-  'putIfAbsent',
-  'remove',
   'isEmpty',
   'isNotEmpty',
   'keys',
   'length',
+  'map',
+  'putIfAbsent',
+  'remove',
+  'removeWhere',
+  'retype',
+  'update',
+  'updateAll',
   'values',
 ];
 

lib/src/protobuf/field_info.dart

@@ -133,5 +133,17 @@ class FieldInfo<T> {
     return m.createRepeatedField<T>(tagNumber, this);
   }
 
+  /// Same as above, but allow a tighter typed List to be created.
+  List<S> _createRepeatedFieldWithType<S extends T>(GeneratedMessage m) {
+    assert(isRepeated);
+    return m.createRepeatedField<S>(tagNumber, this);
+  }
+
+  /// Convenience method to thread this FieldInfo's reified type parameter to
+  /// _FieldSet._ensureRepeatedField.
+  List<T> _ensureRepeatedField(_FieldSet fs) {
+    return fs._ensureRepeatedField<T>(this);
+  }
+
   String toString() => name;
 }

lib/src/protobuf/field_set.dart

@@ -127,6 +127,18 @@ class _FieldSet {
     return value;
   }
 
+  List<T> _getDefaultList<T>(FieldInfo<T> fi) {
+    assert(fi.isRepeated);
+    if (_isReadOnly) return const [];
+
+    // TODO(skybrian) we could avoid this by generating another
+    // method for repeated fields:
+    //   msg.mutableFoo().add(123);
+    var value = fi._createRepeatedFieldWithType<T>(_message);
+    _setNonExtensionFieldUnchecked(fi, value);
+    return value;
+  }
+
   _getFieldOrNullByTag(int tagNumber) {
     var fi = _getFieldInfoOrNull(tagNumber);
     if (fi == null) return null;
@@ -256,6 +268,13 @@ class _FieldSet {
     return _getDefault(_nonExtensionInfoByIndex(index)) as T;
   }
 
+  /// The implementation of a generated getter for repeated fields.
+  List<T> _$getList<T>(int index) {
+    var value = _values[index];
+    if (value != null) return value as List<T>;
+    return _getDefaultList<T>(_nonExtensionInfoByIndex(index));
+  }
+
   /// The implementation of a generated getter for String fields.
   String _$getS(int index, String defaultValue) {
     var value = _values[index];
@@ -520,14 +539,14 @@ class _FieldSet {
       if (mustClone) {
         // fieldValue must be a PbList of GeneratedMessage.
         PbList<GeneratedMessage> pbList = fieldValue;
-        // Copy the mapped values to a List to avoid redundant cloning (since
-        // PbList.addAll iterates over its argument twice).
-        _ensureRepeatedField(fi)
-            .addAll(new List.from(pbList.map(_cloneMessage)));
+        var repeatedFields = fi._ensureRepeatedField(this);
+        for (int i = 0; i < pbList.length; ++i) {
+          repeatedFields.add(_cloneMessage(pbList[i]));
+        }
       } else {
         // fieldValue must be at least a PbList.
         PbList pbList = fieldValue;
-        _ensureRepeatedField(fi).addAll(pbList);
+        fi._ensureRepeatedField(this).addAll(pbList);
       }
       return;
     }

lib/src/protobuf/generated_message.dart

@@ -289,6 +289,9 @@ abstract class GeneratedMessage {
   /// For generated code only.
   T $_getN<T>(int index) => _fieldSet._$getN<T>(index);
 
+  /// For generated code only.
+  List<T> $_getList<T>(int index) => _fieldSet._$getList<T>(index);
+
   /// For generated code only.
   String $_getS(int index, String defaultValue) =>
       _fieldSet._$getS(index, defaultValue);

lib/src/protobuf/json.dart

@@ -87,7 +87,7 @@ void _mergeFromJsonMap(
 
 void _appendJsonList(
     _FieldSet fs, List jsonList, FieldInfo fi, ExtensionRegistry registry) {
-  List repeated = fs._ensureRepeatedField(fi);
+  var repeated = fi._ensureRepeatedField(fs);
   // Micro optimization. Using "for in" generates the following and iterator
   // alloc:
   //   for (t1 = J.get$iterator$ax(json), t2 = fi.tagNumber, t3 = fi.type,

lib/src/protobuf/pb_list.dart

@@ -65,7 +65,7 @@ class PbList<E> extends ListBase<E> {
 
   /// Reduces a collection to a single value by iteratively combining each
   /// element of the collection with an existing value.
-  T fold<T>(T initialValue, T combine(dynamic previousValue, E element)) =>
+  T fold<T>(T initialValue, T combine(T previousValue, E element)) =>
       _wrappedList.fold(initialValue, combine);
 
   /// Checks whether every element of this iterable satisfies [test].

test/reserved_names_test.dart

@@ -6,7 +6,7 @@
 @TestOn("vm")
 library reserved_names_test;
 
-import 'package:test/test.dart' show test, expect, equals, fail, TestOn;
+import 'package:test/test.dart';
 
 import 'package:protobuf/meta.dart' show GeneratedMessage_reservedNames;
 import 'package:protobuf/mixins_meta.dart' show findMixin;
@@ -52,7 +52,8 @@ void main() {
       ..addAll(findMemberNames("dart:collection", #MapMixin))
       ..removeAll(GeneratedMessage_reservedNames);
 
-    expect(actual.toList()..sort(), equals(expected.toList()..sort()));
+    expect(
+        actual.toList()..sort(), containsAllInOrder(expected.toList()..sort()));
   });
 
   test('PbEventMixin reserved names are up to date', () {