Fix for limited invalidation in the middle, and the unlimited invalidation for an exported library.

pkg/analyzer/tool/task_dependency_graph/tasks.dot

 // 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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analyzer/tool/task_dependency_graph/generate.dart".
 //
 // To render this graph using Graphviz (www.graphviz.org) use the command:
 // "dot tasks.dot -Tpdf -O".
@@ skipping 72 matching lines @@
   DART_SCRIPTS [shape=box]
   DartErrorsTask -> DART_ERRORS
   EXPLICITLY_IMPORTED_LIBRARIES [shape=box]
   EXPORTED_LIBRARIES -> BuildDirectiveElementsTask
   EXPORTED_LIBRARIES -> ReadyLibraryElement2Task
   EXPORTED_LIBRARIES -> ReadyLibraryElement5Task
   EXPORTED_LIBRARIES -> ReadyLibraryElement6Task
   EXPORTED_LIBRARIES -> ResolveTopLevelLibraryTypeBoundsTask
   EXPORTED_LIBRARIES [shape=box]
   EXPORT_SOURCE_CLOSURE -> BuildExportNamespaceTask
+  EXPORT_SOURCE_CLOSURE -> ResolveTopLevelUnitTypeBoundsTask
   EXPORT_SOURCE_CLOSURE [shape=box]
   EvaluateUnitConstantsTask -> CREATED_RESOLVED_UNIT13
   EvaluateUnitConstantsTask -> RESOLVED_UNIT13
   GatherUsedImportedElementsTask -> USED_IMPORTED_ELEMENTS
   GatherUsedLocalElementsTask -> USED_LOCAL_ELEMENTS
   GenerateHintsTask -> HINTS
   GenerateLintsTask -> LINTS
   HINTS -> LibraryUnitErrorsTask
   HINTS [shape=box]
   IGNORE_INFO -> DartErrorsTask
@@ skipping 255 matching lines @@
   VARIABLE_REFERENCE_ERRORS -> LibraryUnitErrorsTask
   VARIABLE_REFERENCE_ERRORS [shape=box]
   VERIFY_ERRORS -> LibraryUnitErrorsTask
   VERIFY_ERRORS [shape=box]
   VerifyUnitTask -> VERIFY_ERRORS
   dartErrorsForSource -> DartErrorsTask
   dartErrorsForSource [shape=hexagon]
   dartErrorsForUnit -> DartErrorsTask
   dartErrorsForUnit [shape=hexagon]
 }