Adding support checks for ApplicationCache.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 614cb9f318ad5c75f87c2370f6aca21179ec390d..9b0fefcf45a864742658abd8d94107b99cfbace5 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -213,6 +213,11 @@ class AppletElement extends Element native "*HTMLAppletElement" {
 
 
 /// @domName DOMApplicationCache; @docsEditable true
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.FIREFOX)
+@SupportedBrowser(SupportedBrowser.IE, '10')
+@SupportedBrowser(SupportedBrowser.OPERA)
+@SupportedBrowser(SupportedBrowser.SAFARI)
 class ApplicationCache extends EventTarget native "*DOMApplicationCache" {
 
   static const EventStreamProvider<Event> cachedEvent = const EventStreamProvider<Event>('cached');
@@ -231,6 +236,9 @@ class ApplicationCache extends EventTarget native "*DOMApplicationCache" {
 
   static const EventStreamProvider<Event> updateReadyEvent = const EventStreamProvider<Event>('updateready');
 
+  /// Checks if this type is supported on the current platform.
+  static bool get supported => JS('bool', '!!(window.applicationCache)');
+
   /// @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent; @docsEditable true
   ApplicationCacheEvents get on =>
     new ApplicationCacheEvents(this);