Add --no-declaration-casts option to analyzer.

pkg/analyzer/test/src/context/builder_test.dart

 // Copyright (c) 2016, 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.src.context.context_builder_test;
 
 import 'package:analyzer/context/context_root.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
@@ skipping 996 matching lines @@
     expect(actual.generateSdkErrors, expected.generateSdkErrors);
     expect(actual.hint, expected.hint);
     expect(actual.lint, expected.lint);
     expect(
       actual.lintRules.map((l) => l.name),
       unorderedEquals(expected.lintRules.map((l) => l.name)),
     );
     expect(actual.preserveComments, expected.preserveComments);
     expect(actual.strongMode, expected.strongMode);
     expect(actual.strongModeHints, expected.strongModeHints);
+    expect(actual.declarationCasts, expected.declarationCasts);
     expect(actual.implicitCasts, expected.implicitCasts);
     expect(actual.implicitDynamic, expected.implicitDynamic);
     expect(actual.trackCacheDependencies, expected.trackCacheDependencies);
     expect(actual.disableCacheFlushing, expected.disableCacheFlushing);
   }
 
   Uri _relativeUri(String path, {String from}) {
     String relativePath = pathContext.relative(path, from: from);
     return pathContext.toUri(relativePath);
   }
@@ skipping 25 matching lines @@
 class _MockLintRule implements LintRule {
   final String _name;
 
   _MockLintRule(this._name);
 
   @override
   String get name => _name;
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }