[Signin][Android] Wipe device data on child account signin.

This cl creates a flag and wipes device data when a child account signs
in under that flag. The flag is disabled by default and will be finch
controlled.

Bug: 1188657
Change-Id: I42c623307b59cfc440f564c5db6a8c0a698824d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2784833
Auto-Submit: Tanmoy Mollik <[email protected]>
Commit-Queue: Tanmoy Mollik <[email protected]>
Reviewed-by: Alice Wang <[email protected]>
Reviewed-by: Boris Sazonov <[email protected]>
Reviewed-by: Mihai Sardarescu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#881998}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index ce4e8af..b53e0d0 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -1556,6 +1556,11 @@
     "Enables stronger identity consistency on mobile with different UI "
     "variations";
 
+const char kWipeDataOnChildAccountSigninName[] =
+    "Wipe Data On Child account signin";
+const char kWipeDataOnChildAccountSigninDescription[] =
+    "Wipe Data from previous account when signing in a child account";
+
 const char kMobileIdentityConsistencyFREName[] =
     "Mobile identity consistency FRE";
 const char kMobileIdentityConsistencyFREDescription[] =