[Mac] Move UI item validation to UserInterfaceItemCommandHandler.

chrome/browser/ui/cocoa/chrome_event_processing_window.mm

Index: chrome/browser/ui/cocoa/chrome_event_processing_window.mm
diff --git a/chrome/browser/ui/cocoa/chrome_event_processing_window.mm b/chrome/browser/ui/cocoa/chrome_event_processing_window.mm
index b7b437d923f67200e1a961bb126a05312fb709a3..0b94a91d25a4c20c5f6080aa3ba9877ce3c014cd 100644
--- a/chrome/browser/ui/cocoa/chrome_event_processing_window.mm
+++ b/chrome/browser/ui/cocoa/chrome_event_processing_window.mm
@@ -45,6 +45,20 @@
   return [super performKeyEquivalent:event];
 }
 
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {

[tapted, 2015/09/03 04:15:38]

move down below NSWindow overrides. Maybe

// NSWindow overrides (NSUserInterfaceValidations implementation).

But then... should it also call [super validateUserInterfaceItem] if the
dispatcher returns YES?

I think it should... I suspect this might be responsible for things like
disabling menu items when a Sheet is open (e.g. Cmd+S)

[jackhou1, 2015/09/03 06:15:39]

Done.

+  return
+      [commandDispatcherDelegate_ validateUserInterfaceItem:item window:self];
+}
+
+- (void)commandDispatch:(id)sender {
+  [commandDispatcherDelegate_ commandDispatch:sender window:self];
+}
+
+- (void)commandDispatchUsingKeyModifiers:(id)sender {
+  [commandDispatcherDelegate_ commandDispatchUsingKeyModifiers:sender
+                                                        window:self];
+}
+
 // NSWindow overrides.
 
 - (BOOL)performKeyEquivalent:(NSEvent*)event {