No errors in third-party packages (issue 22170)

pkg/analyzer/lib/src/analyzer_impl.dart

 // Copyright (c) 2013, 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_impl;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:io';
 
@@ skipping 132 matching lines @@
     setupForAnalysis();
     return _analyzeSync(printMode);
   }
 
   void prepareAnalysisContext(JavaFile sourceFile, Source source) {
     List<UriResolver> resolvers = [
       new CustomUriResolver(options.customUrlMappings),
       new DartUriResolver(sdk),
       new FileUriResolver()
     ];
-    // may be add package resolver
+    // maybe add package resolver
     {
       JavaFile packageDirectory;
       if (options.packageRootPath != null) {
         packageDirectory = new JavaFile(options.packageRootPath);
         resolvers.add(new PackageUriResolver([packageDirectory]));
       } else {
         PubPackageMapProvider pubPackageMapProvider =
             new PubPackageMapProvider(PhysicalResourceProvider.INSTANCE, sdk);
         PackageMapInfo packageMapInfo = pubPackageMapProvider.computePackageMap(
             PhysicalResourceProvider.INSTANCE.getResource('.'));
@@ skipping 16 matching lines @@
     }
     // Uncomment the following to have errors reported on stdout and stderr
     AnalysisEngine.instance.logger = new StdLogger(options.log);
 
     // set options for context
     AnalysisOptionsImpl contextOptions = new AnalysisOptionsImpl();
     contextOptions.cacheSize = _MAX_CACHE_SIZE;
     contextOptions.hint = !options.disableHints;
     contextOptions.analyzeFunctionBodiesPredicate =
         _analyzeFunctionBodiesPredicate;
+    contextOptions.generateImplicitErrors = options.showPackageWarnings;
+    contextOptions.generateSdkErrors = options.showSdkWarnings;
     context.analysisOptions = contextOptions;
 
     // Create and add a ChangeSet
     ChangeSet changeSet = new ChangeSet();
     changeSet.addedSource(source);
     context.applyChanges(changeSet);
   }
 
   /// Fills [errorInfos] using [sources].
   void prepareErrors() {
@@ skipping 258 matching lines @@
     }
   }
 
   @override
   void logInformation2(String message, Object exception) {
     if (log) {
       stdout.writeln(message);
     }
   }
 }