Adding support checks for FileSystem APIs and making APIs not webkit-specific.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 85f5683ef36546d80a606f219d69663fbbaf16b0..8754c55e0a1c703c19d92edfcc2cc61de2a432ae 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -11259,6 +11259,9 @@ class FileReaderSync extends NativeFieldWrapperClass1 {
 class FileSystem extends NativeFieldWrapperClass1 {
   FileSystem.internal();
 
+  /// Checks if this type is supported on the current platform.
+  static bool get supported => true;
+
 
   /** @domName DOMFileSystem.name */
   String get name native "DOMFileSystem_name_Getter";
@@ -27098,11 +27101,15 @@ class Window extends EventTarget implements WindowBase {
 
 
   /** @domName DOMWindow.webkitRequestFileSystem */
-  void webkitRequestFileSystem(int type, int size, FileSystemCallback successCallback, [ErrorCallback errorCallback]) native "DOMWindow_webkitRequestFileSystem_Callback";
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @Experimental()
+  void requestFileSystem(int type, int size, FileSystemCallback successCallback, [ErrorCallback errorCallback]) native "DOMWindow_webkitRequestFileSystem_Callback";
 
 
   /** @domName DOMWindow.webkitResolveLocalFileSystemURL */
-  void webkitResolveLocalFileSystemUrl(String url, EntryCallback successCallback, [ErrorCallback errorCallback]) native "DOMWindow_webkitResolveLocalFileSystemURL_Callback";
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @Experimental()
+  void resolveLocalFileSystemUrl(String url, EntryCallback successCallback, [ErrorCallback errorCallback]) native "DOMWindow_webkitResolveLocalFileSystemURL_Callback";
 
   Stream<Event> get onContentLoaded => contentLoadedEvent.forTarget(this);
 
@@ -27613,19 +27620,27 @@ class WorkerContext extends EventTarget {
 
 
   /** @domName WorkerContext.webkitRequestFileSystem */
-  void webkitRequestFileSystem(int type, int size, [FileSystemCallback successCallback, ErrorCallback errorCallback]) native "WorkerContext_webkitRequestFileSystem_Callback";
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @Experimental()
+  void requestFileSystem(int type, int size, [FileSystemCallback successCallback, ErrorCallback errorCallback]) native "WorkerContext_webkitRequestFileSystem_Callback";
 
 
   /** @domName WorkerContext.webkitRequestFileSystemSync */
-  FileSystemSync webkitRequestFileSystemSync(int type, int size) native "WorkerContext_webkitRequestFileSystemSync_Callback";
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @Experimental()
+  FileSystemSync requestFileSystemSync(int type, int size) native "WorkerContext_webkitRequestFileSystemSync_Callback";
 
 
   /** @domName WorkerContext.webkitResolveLocalFileSystemSyncURL */
-  EntrySync webkitResolveLocalFileSystemSyncUrl(String url) native "WorkerContext_webkitResolveLocalFileSystemSyncURL_Callback";
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @Experimental()
+  EntrySync resolveLocalFileSystemSyncUrl(String url) native "WorkerContext_webkitResolveLocalFileSystemSyncURL_Callback";
 
 
   /** @domName WorkerContext.webkitResolveLocalFileSystemURL */
-  void webkitResolveLocalFileSystemUrl(String url, EntryCallback successCallback, [ErrorCallback errorCallback]) native "WorkerContext_webkitResolveLocalFileSystemURL_Callback";
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @Experimental()
+  void resolveLocalFileSystemUrl(String url, EntryCallback successCallback, [ErrorCallback errorCallback]) native "WorkerContext_webkitResolveLocalFileSystemURL_Callback";
 
   Stream<Event> get onError => errorEvent.forTarget(this);