Add Assistant launcher UI about flag

Bug: b/144383302
Test: Manual Test
Change-Id: I738416312657739686b7a303cc3aa79355695e5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915286
Commit-Queue: Yue Li <[email protected]>
Reviewed-by: Xiaohui Chen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#715155}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index a808582a..ab9a44e 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3452,6 +3452,11 @@
     "Combine Launcher search with the power of Assistant to provide the most "
     "useful answer for each query. Requires Assistant to be enabled.";
 
+const char kEnableAssistantLauncherUIName[] = "Assistant Launcher UI";
+const char kEnableAssistantLauncherUIDescription[] =
+    "Enables the embedded Assistant UI in the app list. Requires Assistant to "
+    "be enabled.";
+
 const char kEnableAssistantMediaSessionIntegrationName[] =
     "Assistant Media Session integration";
 const char kEnableAssistantMediaSessionIntegrationDescription[] =