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

tools/dom/docs/docs.json

Index: tools/dom/docs/docs.json
diff --git a/tools/dom/docs/docs.json b/tools/dom/docs/docs.json
index 084eca428bbd919cd755eb2da93af21bee2bf1ec..568e824d90007331ca2915773f60b1032a8e19c8 100644
--- a/tools/dom/docs/docs.json
+++ b/tools/dom/docs/docs.json
@@ -343,6 +343,30 @@
         " */"
       ]
     },
+    "WorkerContext": {
+      "members": {
+        "webkitRequestFileSystem": [
+          "/**",
+          "   * 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. ",
+          "   */"
+        ],
+        "webkitRequestFileSystemSync": [
+          "/**",
+          "   * 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. ",
+          "   */"
+        ]
+      }
+    },
     "XMLHttpRequest": {
       "members": {
         "abort": [