Add unpin/pin context menu for Lacros Chrome.

Bug: 1103012
Change-Id: I97894b8246edaddb610c1887954e0e7822258f05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307616
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790161}

chrome/browser/ui/ash/launcher/app_service/app_service_shelf_context_menu.cc

@@ -529,9 +529,16 @@ bool AppServiceShelfContextMenu::ShouldAddPinMenu() {
       FALLTHROUGH;
     case apps::mojom::AppType::kExtension:
       FALLTHROUGH;
+    case apps::mojom::AppType::kLacros:
+      FALLTHROUGH;
     case apps::mojom::AppType::kWeb:
       return true;
+    case apps::mojom::AppType::kUnknown:
+      FALLTHROUGH;
+    case apps::mojom::AppType::kMacNative:
+      return false;
     default:
+      NOTREACHED() << "All AppType must decide if pin menu should be added.";
       return false;
   }
 }