Fix docs.dart, which has been sad and neglected.

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 4996be93b9a9b9b537ee98812ac27b2b3443b141..c893f6509ac0dcdbe75872a07df48d64b331158b 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -29801,6 +29801,14 @@ class WorkerContext extends EventTarget {
   @DocsEditable
   int setTimeout(Object handler, int timeout) native "WorkerContext_setTimeout_Callback";
 
+  /**
+   * Access a sandboxed file system of the specified `size`. If `persistent` is
+   * true, the application will request permission from the user to create
+   * lasting storage. This storage cannot be freed without the user's
+   * permission. Returns a [Future] whose value stores a reference to the
+   * sandboxed file system for use. Because the file system is sandboxed,
+   * applications cannot access file systems created in other web pages. 
+   */
   @DomName('WorkerContext.webkitRequestFileSystem')
   @DocsEditable
   @SupportedBrowser(SupportedBrowser.CHROME)
@@ -29815,6 +29823,14 @@ class WorkerContext extends EventTarget {
     return completer.future;
   }
 
+  /**
+   * Access a sandboxed file system of the specified `size`. If `persistent` is
+   * true, the application will request permission from the user to create
+   * lasting storage. This storage cannot be freed without the user's
+   * permission. This call will block until a reference to the synchronous file 
+   * system API has been obtained. Because the file system is sandboxed,
+   * applications cannot access file systems created in other web pages. 
+   */
   @DomName('WorkerContext.webkitRequestFileSystemSync')
   @DocsEditable
   @SupportedBrowser(SupportedBrowser.CHROME)