Add access to FutureOr in TypeProviders (and add implementation in mock sdks)

pkg/analyzer/lib/src/generated/resolver.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 8979 matching lines @@
    * Return the type representing 'Future<dynamic>'.
    */
   InterfaceType get futureDynamicType;
 
   /**
    * Return the type representing 'Future<Null>'.
    */
   InterfaceType get futureNullType;
 
   /**
+   * Return the type representing the built-in type 'FutureOr'.
+   */
+  InterfaceType get futureOrType;
+
+  /**
    * Return the type representing the built-in type 'Future'.
    */
   InterfaceType get futureType;
 
   /**
    * Return the type representing the built-in type 'int'.
    */
   InterfaceType get intType;
 
   /**
@@ skipping 168 matching lines @@
    * The type representing 'Future<dynamic>'.
    */
   InterfaceType _futureDynamicType;
 
   /**
    * The type representing 'Future<Null>'.
    */
   InterfaceType _futureNullType;
 
   /**
+   * The type representing the built-in type 'FutureOr'.
+   */
+  InterfaceType _futureOrType;
+
+  /**
    * The type representing the built-in type 'Future'.
    */
   InterfaceType _futureType;
 
   /**
    * The type representing the built-in type 'int'.
    */
   InterfaceType _intType;
 
   /**
@@ skipping 110 matching lines @@
   @override
   InterfaceType get functionType => _functionType;
 
   @override
   InterfaceType get futureDynamicType => _futureDynamicType;
 
   @override
   InterfaceType get futureNullType => _futureNullType;
 
   @override
+  InterfaceType get futureOrType => _futureOrType;
+
+  @override
   InterfaceType get futureType => _futureType;
 
   @override
   InterfaceType get intType => _intType;
 
   @override
   InterfaceType get iterableDynamicType => _iterableDynamicType;
 
   @override
   InterfaceType get iterableType => _iterableType;
@@ skipping 64 matching lines @@
    * Initialize the types provided by this type provider from the given
    * [Namespace]s.
    */
   void _initializeFrom(Namespace coreNamespace, Namespace asyncNamespace) {
     _boolType = _getType(coreNamespace, "bool");
     _bottomType = BottomTypeImpl.instance;
     _deprecatedType = _getType(coreNamespace, "Deprecated");
     _doubleType = _getType(coreNamespace, "double");
     _dynamicType = DynamicTypeImpl.instance;
     _functionType = _getType(coreNamespace, "Function");
+    _futureOrType = _getType(asyncNamespace, "FutureOr");
     _futureType = _getType(asyncNamespace, "Future");
     _intType = _getType(coreNamespace, "int");
     _iterableType = _getType(coreNamespace, "Iterable");
     _listType = _getType(coreNamespace, "List");
     _mapType = _getType(coreNamespace, "Map");
     _nullType = _getType(coreNamespace, "Null");
     _numType = _getType(coreNamespace, "num");
     _objectType = _getType(coreNamespace, "Object");
     _stackTraceType = _getType(coreNamespace, "StackTrace");
     _streamType = _getType(asyncNamespace, "Stream");
@@ skipping 1369 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }