[FedCM] Make signin_url required if ISS is enabled

When the IDP signin status API is enabled, we need to have a signin_url
so we can show the mismatch dialog. This CL implements that.

Bug: 1472328
Change-Id: I86f7f4f46f0f034ee2a842bae4a476d0e260df7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4897378
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1202887}

credential-management/support/fedcm/manifest-not-in-list.json

@@ -1,5 +1,6 @@
 {
   "accounts_endpoint": "accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token.py"
+  "id_assertion_endpoint": "token.py",
+  "signin_url": "signin.html"
 }

credential-management/support/fedcm/manifest.py

@@ -13,6 +13,7 @@ def main(request, response):
   "accounts_endpoint": "accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token.py",
-  "revocation_endpoint": "revoke.py"
+  "revocation_endpoint": "revoke.py",
+  "signin_url": "signin.html"
 }
 """

credential-management/support/fedcm/manifest_redirect_accounts.json

@@ -1,5 +1,6 @@
 {
   "accounts_endpoint": "/common/redirect.py?location=/credential-management/support/fedcm/accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token.py"
+  "id_assertion_endpoint": "token.py",
+  "signin_url": "signin.html"
 }

credential-management/support/fedcm/manifest_redirect_token.json

@@ -2,5 +2,6 @@
   "accounts_endpoint": "accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "/common/redirect.py?location=/credential-management/support/fedcm/token.py&status=308",
-  "revocation_endpoint": "revoke.py"
+  "revocation_endpoint": "revoke.py",
+  "signin_url": "signin.html"
 }

credential-management/support/fedcm/manifest_with_account_auto_selected_flag.json

@@ -1,5 +1,6 @@
 {
   "accounts_endpoint": "two_accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token_with_account_auto_selected_flag.py"
+  "id_assertion_endpoint": "token_with_account_auto_selected_flag.py",
+  "signin_url": "signin.html"
 }

credential-management/support/fedcm/manifest_with_no_accounts.json

@@ -1,5 +1,6 @@
 {
   "accounts_endpoint": "no_accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token_with_account_id.py"
+  "id_assertion_endpoint": "token_with_account_id.py",
+  "signin_url": "signin.html"
 }

credential-management/support/fedcm/manifest_with_single_account.json

@@ -1,5 +1,6 @@
 {
   "accounts_endpoint": "single_account.py",
   "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token_with_account_id.py"
+  "id_assertion_endpoint": "token_with_account_id.py",
+  "signin_url": "signin.html"
 }

credential-management/support/fedcm/manifest_with_two_accounts.json

@@ -1,5 +1,6 @@
 {
   "accounts_endpoint": "two_accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token_with_account_id.py"
+  "id_assertion_endpoint": "token_with_account_id.py",
+  "signin_url": "signin.html"
 }