Refactor common portions of the two SDK implementations into a base class

pkg/analyzer_cli/lib/src/build_mode.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_cli.src.build_mode;
 
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
 import 'package:analyzer/dart/ast/ast.dart' show CompilationUnit;
@@ skipping 239 matching lines @@
           options.dartSdkSummaryPath, options.strongMode);
       sdk = summarySdk;
       sdkBundle = summarySdk.bundle;
     } else {
       DirectoryBasedDartSdk directorySdk =
           new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
       directorySdk.analysisOptions =
           Driver.createAnalysisOptionsForCommandLineOptions(options);
       directorySdk.useSummary = !options.buildSummaryOnlyAst;
       sdk = directorySdk;
-      sdkBundle = directorySdk.getSummarySdkBundle();
+      sdkBundle = directorySdk.getSummarySdkBundle(options.strongMode);
     }
 
     // In AST mode include SDK bundle to avoid parsing SDK sources.
     if (options.buildSummaryOnlyAst) {
       summaryDataStore.addBundle(null, sdkBundle);
     }
 
     // Create the context.
     context = AnalysisEngine.instance.createAnalysisContext();
     context.sourceFactory = new SourceFactory(<UriResolver>[
@@ skipping 100 matching lines @@
             'Illegal input file (must be "\$uri|\$path"): $sourceFile');
         return null;
       }
       Uri uri = Uri.parse(sourceFile.substring(0, pipeIndex));
       String path = sourceFile.substring(pipeIndex + 1);
       uriToFileMap[uri] = new JavaFile(path);
     }
     return uriToFileMap;
   }
 }