Update analyzer-experimental.

pkg/analyzer-experimental/lib/src/generated/java_engine.dart

 library java.engine;
 
-import "dart:io";
-import "java_core.dart";
-import "source.dart";
-import "error.dart";
-import "ast.dart";
-import "element.dart";
-
-//class AnalysisException implements Exception {
-//  String toString() => "AnalysisException";
-//}
-
-//class AnalysisEngine {
-//  static getInstance() {
-//    throw new UnsupportedOperationException();
-//  }
-//}
-
-//class AnalysisContext {
-//  Element getElement(ElementLocation location) {
-//    throw new UnsupportedOperationException();
-//  }
-//}
-
-//class AnalysisContextImpl extends AnalysisContext {
-//  getSourceFactory() {
-//    throw new UnsupportedOperationException();
-//  }
-//  LibraryElement getLibraryElementOrNull(Source source) {
-//    return null;
-//  }
-//  LibraryElement getLibraryElement(Source source) {
-//    throw new UnsupportedOperationException();
-//  }
-//  void recordLibraryElements(Map<Source, LibraryElement> elementMap) {
-//    throw new UnsupportedOperationException();
-//  }
-//  getPublicNamespace(LibraryElement library) {
-//    throw new UnsupportedOperationException();
-//  }
-//  CompilationUnit parse(Source source, AnalysisErrorListener errorListener) {
-//    throw new UnsupportedOperationException();
-//  }
-//}
-
 class StringUtilities {
   static List<String> EMPTY_ARRAY = new List(0);
 }
 
-File createFile(String path) => new File(path);
-
-class OSUtilities {
-  static bool isWindows() => Platform.operatingSystem == 'windows';
-  static bool isMac() => Platform.operatingSystem == 'macos';
+class FileNameUtilities {
+  static String getExtension(String fileName) {
+    if (fileName == null) {
+      return "";
+    }
+    int index = fileName.lastIndexOf('.');
+    if (index >= 0) {
+      return fileName.substring(index + 1);
+    }
+    return "";
+  }
 }