Add kEnablePasswordsAccountStorage to chrome://flags on mobile

Also expose the feature to Java for Android. The feature name and
description are the same once used for desktop.
https://chromium-review.googlesource.com/c/chromium/src/+/1768342/4/chrome/browser/flag_descriptions.cc

Bug: 1374242,1348950
Change-Id: Idf16e1d9a17b35ca7a2fec70d14c90b040160649
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3959838
Commit-Queue: Victor Vianna <[email protected]>
Auto-Submit: Victor Vianna <[email protected]>
Quick-Run: Victor Vianna <[email protected]>
Reviewed-by: Marc Treib <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1060387}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index f6f6629..39ecf2d 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3599,6 +3599,12 @@
 const char kEnableFamilyInfoFeedbackDescription[] =
     "Enable FamilyLink feedback source in Chrome Settings feedback";
 
+const char kEnablePasswordsAccountStorageName[] =
+    "Enable the account data storage for passwords";
+const char kEnablePasswordsAccountStorageDescription[] =
+    "Enables storing passwords in a second, Gaia-account-scoped storage for "
+    "signed-in but not syncing users";
+
 const char kEnableOskResizesVisualViewportByDefaultName[] =
     "Enable OSK resizes visual viewport by default";
 const char kEnableOskResizesVisualViewportByDefaultDescription[] =