Implement WebKit IDL 'module' feature [Supplemental=Foo]

client/dom/frog/dom_frog.dart

Index: client/dom/frog/dom_frog.dart
diff --git a/client/dom/frog/dom_frog.dart b/client/dom/frog/dom_frog.dart
index 60efd9a866fc626b3f815de9216a322f4c392123..0efe8619eb67d2a68123b4d2373d17dbd9ca6b7d 100644
--- a/client/dom/frog/dom_frog.dart
+++ b/client/dom/frog/dom_frog.dart
@@ -1493,6 +1493,8 @@ class DOMWindowJs extends DOMTypeJs implements DOMWindow native "@*DOMWindow" {
 
   DOMWindowJs open(String url, String name, [String options = null]) native;
 
+  DatabaseJs openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback = null]) native;
+
   void postMessage(String message, String targetOrigin, [List messagePorts = null]) native;
 
   void print() native;
@@ -14731,6 +14733,8 @@ interface Window extends EventTarget {
 
   DOMWindow open(String url, String name, [String options]);
 
+  Database openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback]);
+
   void postMessage(String message, String targetOrigin, [List messagePorts]);
 
   void print();