Flush results when contexts are made idle.

pkg/analyzer/test/generated/engine_test.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.test.generated.engine_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 259 matching lines @@
     fail("Unexpected invocation of getHtmlSources");
     return null;
   }
 
   @override
   Stream<ImplicitAnalysisEvent> get implicitAnalysisEvents {
     fail("Unexpected invocation of analyzedSources");
     return null;
   }
 
+  bool get isActive {
+    fail("Unexpected invocation of isActive");
+    return false;
+  }
+
+  void set isActive(bool isActive) {
+    fail("Unexpected invocation of isActive");
+  }
+
   @override
   bool get isDisposed {
     fail("Unexpected invocation of isDisposed");
     return false;
   }
 
   @override
   List<Source> get launchableClientLibrarySources {
     fail("Unexpected invocation of getLaunchableClientLibrarySources");
     return null;
@@ skipping 415 matching lines @@
   @override
   void test_flushAstStructures(Source source) {
     fail("Unexpected invocation of test_flushAstStructures");
   }
 
   @override
   void visitContentCache(ContentCacheVisitor visitor) {
     fail("Unexpected invocation of visitContentCache");
   }
 }