Make KeyboardEvent cross-browser consistent.

sdk/lib/html/templates/html/impl/impl_UIEvent.darttemplate

Index: sdk/lib/html/templates/html/impl/impl_UIEvent.darttemplate
diff --git a/sdk/lib/html/templates/html/impl/impl_Event.darttemplate b/sdk/lib/html/templates/html/impl/impl_UIEvent.darttemplate
similarity index 69%
copy from sdk/lib/html/templates/html/impl/impl_Event.darttemplate
copy to sdk/lib/html/templates/html/impl/impl_UIEvent.darttemplate
index c1cf0961fa122cae2a8c1e766c24f8f949fc3d5f..ce957c8ab70952666788c879561c5ca732496d46 100644
--- a/sdk/lib/html/templates/html/impl/impl_Event.darttemplate
+++ b/sdk/lib/html/templates/html/impl/impl_UIEvent.darttemplate
@@ -6,7 +6,7 @@
 
 part of html;
 
-/// @domName $DOMNAME
+/// @domName $DOMNAME; @docsEditable true
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   // In JS, canBubble and cancelable are technically required parameters to
   // init*Event. In practice, though, if they aren't provided they simply
@@ -14,7 +14,11 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   //
   // Contrary to JS, we default canBubble and cancelable to true, since that's
   // what people want most of the time anyway.
-  factory $CLASSNAME(String type, [bool canBubble = true, bool cancelable = true]) =>
-      _$(CLASSNAME)FactoryProvider.create$CLASSNAME(type, canBubble, cancelable);
+  factory $CLASSNAME(String type, Window view, int detail,
+      [bool canBubble = true, bool cancelable = true]) {
+    final e = document.$dom_createEvent("UIEvent");
+    e.$dom_initUIEvent(type, canBubble, cancelable, view, detail);
+    return e;
+  }
 $!MEMBERS
 }