Updating KeyboardEvent constructor to use named parameters.

tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate

Index: tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
diff --git a/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate b/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
index ff542eb7078326cfaaf971162c07e24c26502d10..2f30bd1c63a5f31b4945b26e336b9066c52aab13 100644
--- a/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
+++ b/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
@@ -6,11 +6,14 @@ part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
-  factory $CLASSNAME(String type, Window view,
-      [bool canBubble = true, bool cancelable = true,
-      String keyIdentifier = "", int keyLocation = 1, bool ctrlKey = false,
-      bool altKey = false, bool shiftKey = false, bool metaKey = false,
-      bool altGraphKey = false]) {
+  factory $CLASSNAME(String type,
+      {Window view, bool canBubble: true, bool cancelable: true,
+      String keyIdentifier: "", int keyLocation: 1, bool ctrlKey: false,
+      bool altKey: false, bool shiftKey: false, bool metaKey: false,
+      bool altGraphKey: false}) {
+    if (view == null) {
+      view = window;
+    }
     final e = document.$dom_createEvent("KeyboardEvent");
     e.$dom_initKeyboardEvent(type, canBubble, cancelable, view, keyIdentifier,
         keyLocation, ctrlKey, altKey, shiftKey, metaKey, altGraphKey);