First batch of changes to make analyzer package strong mode error free

pkg/analyzer/lib/src/context/cache.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.context.cache;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/dart/element/element.dart'
@@ skipping 387 matching lines @@
    * the default value for the result if this entry does not have a valid value.
    */
   dynamic/*=V*/ getValue/*<V>*/(ResultDescriptor/*<V>*/ descriptor) {
     ResultData data = _resultMap[descriptor];
     if (data == null) {
       return descriptor.defaultValue;
     }
     if (_partition != null) {
       _partition.resultAccessed(target, descriptor);
     }
-    return data.value;
+    return data.value as Object/*=V*/;
   }
 
   /**
    * Return `true` if the state of any data value is [CacheState.ERROR].
    */
   bool hasErrorState() {
     for (ResultData data in _resultMap.values) {
       if (data.state == CacheState.ERROR) {
         return true;
       }
@@ skipping 850 matching lines @@
   void resultAccessed(TargetedResult result) {}
 
   @override
   List<TargetedResult> resultStored(TargetedResult newResult, newValue) {
     return TargetedResult.EMPTY_LIST;
   }
 
   @override
   void targetRemoved(AnalysisTarget target) {}
 }