Store also 'hasMixinApplication' flag with UnlinkedUnit.

pkg/front_end/lib/src/incremental/format.dart

 // Copyright (c) 2017, 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.
 
 import 'package:front_end/src/base/flat_buffers.dart' as fb;
 
 /// Unlinked information about a `show` or `hide` combinator in an import or
 /// export directive.
 abstract class UnlinkedCombinator {
   factory UnlinkedCombinator(List<int> bytes) {
@@ skipping 106 matching lines @@
     return const _UnlinkedUnitReader().read(rootRef, 0);
   }
 
   /// API signature of the unit.
   /// It depends on all non-comment tokens outside the block bodies.
   List<int> get apiSignature;
 
   /// Export directives in the compilation unit.
   List<UnlinkedNamespaceDirective> get exports;
 
+  /// Whether the unit has a mixin application.
+  bool get hasMixinApplication;
+
   /// Import directives in the compilation unit.
   List<UnlinkedNamespaceDirective> get imports;
 
   /// Part directives in the compilation unit.
   List<UnlinkedNamespaceDirective> get parts;
 }
 
 /// Builder of [UnlinkedUnit]s.
 class UnlinkedUnitBuilder {
   List<int> _apiSignature;
   List<UnlinkedNamespaceDirectiveBuilder> _imports;
   List<UnlinkedNamespaceDirectiveBuilder> _exports;
   List<UnlinkedNamespaceDirectiveBuilder> _parts;
+  bool _hasMixinApplication;
 
   UnlinkedUnitBuilder(
       {List<int> apiSignature,
       List<UnlinkedNamespaceDirectiveBuilder> imports,
       List<UnlinkedNamespaceDirectiveBuilder> exports,
-      List<UnlinkedNamespaceDirectiveBuilder> parts})
+      List<UnlinkedNamespaceDirectiveBuilder> parts,
+      bool hasMixinApplication})
       : _apiSignature = apiSignature,
         _imports = imports,
         _exports = exports,
-        _parts = parts;
+        _parts = parts,
+        _hasMixinApplication = hasMixinApplication;
 
   void set exports(List<UnlinkedNamespaceDirectiveBuilder> value) {
     this._exports = value;
   }
 
+  void set hasMixinApplication(bool value) {
+    this._hasMixinApplication = value;
+  }
+
   void set imports(List<UnlinkedNamespaceDirectiveBuilder> value) {
     this._imports = value;
   }
 
   void set parts(List<UnlinkedNamespaceDirectiveBuilder> value) {
     this._parts = value;
   }
 
   /// Finish building, and store into the [fbBuilder].
   fb.Offset finish(fb.Builder fbBuilder) {
@@ skipping 22 matching lines @@
     }
     if (offset_imports != null) {
       fbBuilder.addOffset(1, offset_imports);
     }
     if (offset_exports != null) {
       fbBuilder.addOffset(2, offset_exports);
     }
     if (offset_parts != null) {
       fbBuilder.addOffset(3, offset_parts);
     }
+    if (_hasMixinApplication == true) {
+      fbBuilder.addBool(4, _hasMixinApplication);
+    }
     return fbBuilder.endTable();
   }
 }
 
 class _UnlinkedCombinatorImpl implements UnlinkedCombinator {
   final fb.BufferContext _bc;
   final int _bcOffset;
 
   List<String> _shows;
   List<String> _hides;
@@ skipping 59 matching lines @@
 }
 
 class _UnlinkedUnitImpl implements UnlinkedUnit {
   final fb.BufferContext _bc;
   final int _bcOffset;
 
   List<int> _apiSignature;
   List<UnlinkedNamespaceDirective> _imports;
   List<UnlinkedNamespaceDirective> _exports;
   List<UnlinkedNamespaceDirective> _parts;
+  bool _hasMixinApplication;
 
   _UnlinkedUnitImpl(this._bc, this._bcOffset);
 
   @override
   List<int> get apiSignature {
     _apiSignature ??=
         const fb.Uint8ListReader().vTableGet(_bc, _bcOffset, 0, const <int>[]);
     return _apiSignature;
   }
 
   @override
   List<UnlinkedNamespaceDirective> get exports {
     _exports ??= const fb.ListReader<UnlinkedNamespaceDirective>(
             const _UnlinkedNamespaceDirectiveReader())
         .vTableGet(_bc, _bcOffset, 2, const <UnlinkedNamespaceDirective>[]);
     return _exports;
   }
 
   @override
+  bool get hasMixinApplication {
+    _hasMixinApplication ??=
+        const fb.BoolReader().vTableGet(_bc, _bcOffset, 4, false);
+    return _hasMixinApplication;
+  }
+
+  @override
   List<UnlinkedNamespaceDirective> get imports {
     _imports ??= const fb.ListReader<UnlinkedNamespaceDirective>(
             const _UnlinkedNamespaceDirectiveReader())
         .vTableGet(_bc, _bcOffset, 1, const <UnlinkedNamespaceDirective>[]);
     return _imports;
   }
 
   @override
   List<UnlinkedNamespaceDirective> get parts {
     _parts ??= const fb.ListReader<UnlinkedNamespaceDirective>(
             const _UnlinkedNamespaceDirectiveReader())
         .vTableGet(_bc, _bcOffset, 3, const <UnlinkedNamespaceDirective>[]);
     return _parts;
   }
 }
 
 class _UnlinkedUnitReader extends fb.TableReader<UnlinkedUnit> {
   const _UnlinkedUnitReader();
 
   @override
   _UnlinkedUnitImpl createObject(fb.BufferContext bc, int offset) =>
       new _UnlinkedUnitImpl(bc, offset);
 }