fix KeyEvent and KeyboardEvent

tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate

Index: tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
diff --git a/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate b/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
index 0cea80315ffda61971fa7536c137e6a7c0254de8..408c641ac195d45c93041ea51d4df7389da3ce9f 100644
--- a/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
+++ b/tools/dom/templates/html/dart2js/impl_KeyboardEvent.darttemplate
@@ -26,20 +26,20 @@ $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS
    */
   factory $CLASSNAME(String type,
       {Window view, bool canBubble: true, bool cancelable: true,
-      int keyLocation: 1, bool ctrlKey: false,
+      int location: 1, bool ctrlKey: false,

[Jacob, 2017/05/12 23:28:18]

We shouldn't be making breaking changes to the Dart API for common classes
unless we can avoid it.
I would change this name back to keyLocation even though location is indeed a
better variable name.
You could always add
location as well as keyLocation.

       bool altKey: false, bool shiftKey: false, bool metaKey: false}) {
     if (view == null) {
       view = window;
     }
     KeyboardEvent e = document._createEvent("KeyboardEvent");
     e._initKeyboardEvent(type, canBubble, cancelable, view, "",
-        keyLocation, ctrlKey, altKey, shiftKey, metaKey);
+        location, ctrlKey, altKey, shiftKey, metaKey);
     return e;
   }
 
   @DomName('KeyboardEvent.initKeyboardEvent')
   void _initKeyboardEvent(String type, bool canBubble, bool cancelable,
-      Window view, String keyIdentifier, int keyLocation, bool ctrlKey,
+      Window view, String keyIdentifier, int location, bool ctrlKey,
       bool altKey, bool shiftKey, bool metaKey) {
     if (JS('bool', 'typeof(#.initKeyEvent) == "function"', this)) {
       // initKeyEvent is only in Firefox (instead of initKeyboardEvent). It has
@@ -52,7 +52,7 @@ $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS
     } else {
       // initKeyboardEvent is for all other browsers.
       JS('void', '#.initKeyboardEvent(#, #, #, #, #, #, #, #, #, #)', this,
-          type, canBubble, cancelable, view, keyIdentifier, keyLocation,
+          type, canBubble, cancelable, view, keyIdentifier, location,
           ctrlKey, altKey, shiftKey, metaKey);
     }
   }