Tweaks for using task model in Editor.

pkg/analyzer/lib/src/task/driver.dart

 // Copyright (c) 2015, 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.task.driver;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 348 matching lines @@
    * returned if some of the inputs cannot be computed and the task cannot be
    * performed. Callers can differentiate between these cases by checking the
    * [exception] field. If the field is `null`, then the task can be performed;
    * if the field is non-`null` then the task cannot be performed and all of the
    * tasks' results should be marked as being in ERROR.
    */
   WorkItem gatherInputs(TaskManager taskManager) {
     while (builder != null) {
       AnalysisTarget inputTarget = builder.currentTarget;
       ResultDescriptor inputResult = builder.currentResult;
-      inputTargetedResults.add(new TargetedResult(inputTarget, inputResult));
+      if (inputTarget is! AnalysisContextTarget) {
+        inputTargetedResults.add(new TargetedResult(inputTarget, inputResult));
+      }
       CacheEntry inputEntry = context.getCacheEntry(inputTarget);
       CacheState inputState = inputEntry.getState(inputResult);
       if (inputState == CacheState.ERROR) {
         exception = inputEntry.exception;
         return null;
       } else if (inputState == CacheState.IN_PROCESS) {
         //
         // TODO(brianwilkerson) Implement this case.
         //
         // One possibility would be to return a WorkItem that would perform a
@@ skipping 155 matching lines @@
     TaskDescriptor descriptor = currentItem.descriptor;
     AnalysisTarget target = currentItem.target;
     for (WorkItem item in pendingItems) {
       if (item.descriptor == descriptor && item.target == target) {
         return true;
       }
     }
     return false;
   }
 }