Expand kPasswordProtectionForSavedPasswords to add domains.

Expand saved password protection experiment to add a flag
on whether or not to show a list of domains in the modal
warning and include a button to route the user to the first
domain that the password was saved on.

Bug: 1015671
Change-Id: I5e5343ea19258ff7fe54044cbdc17e85033edf23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867095Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Bettina Dea <bdea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707211}

components/safe_browsing/features.cc

@@ -79,6 +79,10 @@ const base::Feature kSendPasswordReusePing {
 };
 #endif
 
+constexpr base::FeatureParam<bool> kShouldShowDomainsForSavedPassword{
+    &kPasswordProtectionForSavedPasswords, "ShouldShowDomainsForSavedPassword",
+    false};
+
 const base::Feature kSendSampledPingsForAllowlistDomains{
     "SafeBrowsingSendSampledPingsForAllowlistDomain",
     base::FEATURE_DISABLED_BY_DEFAULT};
@@ -158,4 +162,8 @@ bool GetShouldFillOldPhishGuardProto() {
   return kShouldFillOldPhishGuardProto.Get();
 }
 
+bool ShouldShowDomainsForSavedPassword() {
+  return kShouldShowDomainsForSavedPassword.Get();
+}
+
 }  // namespace safe_browsing

components/safe_browsing/features.h

@@ -107,8 +107,12 @@ base::ListValue GetFeatureStatusList();
 
 // Returns whether or not to stop filling in the SyncAccountType and
 // ReusedPasswordType enums. This is used in the
-// kPasswordProtectionForSignedInUsers experiment.
+// |kPasswordProtectionForSignedInUsers| experiment.
 bool GetShouldFillOldPhishGuardProto();
 
+// Returns whether or not to show a list of domains the saved password was used
+// on. This is used in the |kPasswordProtectionForSavedPasswords| experiment.
+bool ShouldShowDomainsForSavedPassword();
+
 }  // namespace safe_browsing
 #endif  // COMPONENTS_SAFE_BROWSING_FEATURES_H_