Adding support checks for ApplicationCache.

tests/html/cache_test.dart

 library CacheTest;
 import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.dart';
+import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 main() {
-  useHtmlConfiguration();
-  test('ApplicationCache', () {
-    ApplicationCache appCache = window.applicationCache;
-    expect(cacheStatusToString(appCache.status), equals("UNCACHED"));
+  useHtmlIndividualConfiguration();
+
+  group('supported', () {
+    test('supported', () {
+      expect(ApplicationCache.supported, true);
+    });
   });
+
+  group('ApplicationCache', () {
+    test('ApplicationCache', () {
+      var expectation = ApplicationCache.supported ? returnsNormally : throws;
+      expect(() {
+        ApplicationCache appCache = window.applicationCache;
+        expect(cacheStatusToString(appCache.status), "UNCACHED");
+      }, expectation);
+
+    });
+  });
+
 }
 
 String cacheStatusToString(int status) {
   switch (status) {
     case ApplicationCache.UNCACHED: // UNCACHED == 0
       return 'UNCACHED';
     case ApplicationCache.IDLE: // IDLE == 1
       return 'IDLE';
     case ApplicationCache.CHECKING: // CHECKING == 2
       return 'CHECKING';
     case ApplicationCache.DOWNLOADING: // DOWNLOADING == 3
       return 'DOWNLOADING';
     case ApplicationCache.UPDATEREADY:  // UPDATEREADY == 4
       return 'UPDATEREADY';
     case ApplicationCache.OBSOLETE: // OBSOLETE == 5
       return 'OBSOLETE';
     default:
       return 'UNKNOWN CACHE STATUS';
   };
 }