[Password Manager] Add UMA stats to track interaction with synced accounts.

components/password_manager/core/browser/password_store_default.cc

Index: components/password_manager/core/browser/password_store_default.cc
diff --git a/components/password_manager/core/browser/password_store_default.cc b/components/password_manager/core/browser/password_store_default.cc
index b450357d2e2e7835e56d33a55173421b3cd368f6..08577c73f0d83ddcbe4e9a9b8c02aa54ebab84f2 100644
--- a/components/password_manager/core/browser/password_store_default.cc
+++ b/components/password_manager/core/browser/password_store_default.cc
@@ -26,9 +26,10 @@ PasswordStoreDefault::PasswordStoreDefault(
 PasswordStoreDefault::~PasswordStoreDefault() {
 }
 
-void PasswordStoreDefault::ReportMetricsImpl() {
+void PasswordStoreDefault::ReportMetricsImpl(const std::string& sync_username,
+                                             enum SyncState sync_state) {
   DCHECK(GetBackgroundTaskRunner()->BelongsToCurrentThread());
-  login_db_->ReportMetrics();
+  login_db_->ReportMetrics(sync_username, sync_state);
 }
 
 PasswordStoreChangeList PasswordStoreDefault::AddLoginImpl(