expose strong checker API, for use by analyzer_cli

bin/edit_files.dart

Index: bin/edit_files.dart
diff --git a/bin/edit_files.dart b/bin/edit_files.dart
index 384a2e4d9cd3ddcf5afe2e346843e19ee2c4943a..1d95b4442353dacdc659e3b2d3333956d30df899 100644
--- a/bin/edit_files.dart
+++ b/bin/edit_files.dart
@@ -135,7 +135,7 @@ void main(List<String> argv) {
   }
 
   var filename = args.rest.first;
-  var options = new CompilerOptions(
+  var options = new SourceResolverOptions(
       dartSdkPath: sdkDir.path,
       useMultiPackage: args['use-multi-package'],
       packageRoot: args['package-root'],
@@ -150,7 +150,8 @@ void main(List<String> argv) {
       ? new RegExp(args['include-pattern'])
       : null;
 
-  var context = createAnalysisContext(options);
+  var context =
+      createAnalysisContextWithSources(new StrongModeOptions(), options);
   var visitor = new EditFileSummaryVisitor(context, args['level'],
       args['checkout-files-executable'], args['checkout-files-arg'],
       includePattern, excludePattern);