[Mac] Move UI item validation to UserInterfaceItemCommandHandler.

ui/views/cocoa/native_widget_mac_nswindow.mm

Index: ui/views/cocoa/native_widget_mac_nswindow.mm
diff --git a/ui/views/cocoa/native_widget_mac_nswindow.mm b/ui/views/cocoa/native_widget_mac_nswindow.mm
index 1de283fb956b7dc53d180ed36ec06e1e07d4ae91..9ef65daf887f10f4e9633a8dd4a3e6aa4f7a6d58 100644
--- a/ui/views/cocoa/native_widget_mac_nswindow.mm
+++ b/ui/views/cocoa/native_widget_mac_nswindow.mm
@@ -23,6 +23,7 @@
 @implementation NativeWidgetMacNSWindow {
  @private
   base::scoped_nsobject<CommandDispatcher> commandDispatcher_;
+  id<UserInterfaceItemCommandHandler> commandHandler_;
 }
 
 - (instancetype)initWithContentRect:(NSRect)contentRect
@@ -44,6 +45,11 @@
   [commandDispatcher_ setDelegate:delegate];
 }
 
+- (void)setUserInterfaceItemCommandHandler:
+    (id<UserInterfaceItemCommandHandler>)commandHandler {
+  commandHandler_ = commandHandler;
+}
+
 // Private methods.
 
 - (ViewsNSWindowDelegate*)viewsNSWindowDelegate {
@@ -168,4 +174,16 @@
   return [super performKeyEquivalent:event];
 }
 
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {

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

same comments as on CEPW

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

Done.

+  return [commandHandler_ validateUserInterfaceItem:item window:self];
+}
+
+- (void)commandDispatch:(id)sender {
+  [commandHandler_ commandDispatch:sender window:self];
+}
+
+- (void)commandDispatchUsingKeyModifiers:(id)sender {
+  [commandHandler_ commandDispatchUsingKeyModifiers:sender window:self];
+}
+
 @end