Add feature flag for quick answers.

Bug: b/144316777
Test: Manual
Change-Id: Id9a8a85875a96695833c84e878569a793b642e16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913095
Commit-Queue: Li Lin <[email protected]>
Reviewed-by: Xiyuan Xia <[email protected]>
Reviewed-by: Xiaohui Chen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#723224}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 871a0ab..c77c170 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2090,6 +2090,9 @@
 extern const char kEnablePlayStoreSearchName[];
 extern const char kEnablePlayStoreSearchDescription[];
 
+extern const char kEnableQuickAnswersName[];
+extern const char kEnableQuickAnswersDescription[];
+
 extern const char kEnableVideoPlayerNativeControlsName[];
 extern const char kEnableVideoPlayerNativeControlsDescription[];