Add InterfaceType.allSupertypes.

R=brianwilkerson@google.com

Change-Id: I9c5058091b1a4473a2535ba792aa6bbfac35793c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/153945
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

pkg/analyzer/CHANGELOG.md

@@ -3,6 +3,7 @@
 * Added `DynamicType`, `NeverType`, and `VoidType` interfaces.
 * Added `TypeVisitor` and `DartType.accept(TypeVisitor)`.
 * Changed `ConstructorElement.returnType` to `InterfaceType`.
+* Added `InterfaceType.allSupertypes`.
 * Added `InterfaceType.asInstanceOf(ClassElement)`.
 * Removed deprecated internal `bogus-disabled` and `bogus-enabled`.
 

pkg/analyzer/lib/dart/element/type.dart

@@ -261,6 +261,10 @@ abstract class InterfaceType implements ParameterizedType {
   /// declared in this type.
   List<PropertyAccessorElement> get accessors;
 
+  /// Return all the super-interfaces implemented by this interface. This
+  /// includes superclasses, mixins, interfaces, and superclass constraints.
+  List<InterfaceType> get allSupertypes;
+
   /// Return a list containing all of the constructors declared in this type.
   List<ConstructorElement> get constructors;
 

pkg/analyzer/lib/src/dart/element/type.dart

@@ -716,6 +716,12 @@ class InterfaceTypeImpl extends TypeImpl implements InterfaceType {
     return _accessors;
   }
 
+  @override
+  List<InterfaceType> get allSupertypes {
+    var substitution = Substitution.fromInterfaceType(this);
+    return element.allSupertypes.map(substitution.substituteType).toList();
+  }
+
   @override
   List<ConstructorElement> get constructors {
     if (_constructors == null) {