[Mac] added support for show as tab on popups, similar behavior that exists in windows in which rep…

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index e657c7727b9d5a06457e57b7978d557b817171d4..6cd8421d6a657e4b00a0bf6810c7b8c887b1695c 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -1122,6 +1122,18 @@ using content::WebContents;
       // Generate return value (enabled state)
       enable = chrome::IsCommandEnabled(browser_.get(), tag);
       switch (tag) {
+        case IDC_SHOW_AS_TAB:
+          if (NSMenuItem* menuItem = base::mac::ObjCCast<NSMenuItem>(item)) {
+            bool shouldHide = browser_->is_type_tabbed();
+            [menuItem setHidden:shouldHide];
+          }
+          break;
+        case IDC_NEW_TAB:
+          if (NSMenuItem* menuItem = base::mac::ObjCCast<NSMenuItem>(item)) {
+            bool shouldHide = !browser_->is_type_tabbed();
+            [menuItem setHidden:shouldHide];
+          }
+          break;
         case IDC_CLOSE_TAB:
           // Disable "close tab" if the receiving window is not tabbed.
           // We simply check whether the item has a keyboard shortcut set here;