Add an about flag to toggle the visibility of "All bookmarks"

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b48d3c81a867f41a187ae86a2af1a0a182753134..570f55ade4a8132d0520009eeb166289e5f88d82 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14780,6 +14780,12 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
     <message name="IDS_FLAGS_ENABLE_SCROLL_ANCHORING_DESCRIPTION" desc="Description of the scroll anchoring flag">
       Adjusts scroll position to prevent visible jumps when offscreen content changes.
     </message>
+    <message name="IDS_FLAGS_ENABLE_ALL_BOOKMARKS_VIEW_NAME" desc="Name of the show all bookmarks view flag">
+      Enable "all bookmarks" section in bookmark manager.
+    </message>
+    <message name="IDS_FLAGS_SHOW_ALL_BOOKMARKS_VIEW_DESCRIPTION" desc="Description of the show all bookmarks view flag">
+      Enables the all bookmarks view as the default destination of the bookmark manager.
+    </message>
 
     <if expr="chromeos">
       <message name="IDS_FLAGS_ENABLE_NATIVE_CUPS_NAME" desc="Name of the native cups flag.">