[Password Manager] Add UMA stats for custom passphrase users.

chrome/browser/password_manager/chrome_password_manager_client.h

Index: chrome/browser/password_manager/chrome_password_manager_client.h
diff --git a/chrome/browser/password_manager/chrome_password_manager_client.h b/chrome/browser/password_manager/chrome_password_manager_client.h
index f3a2ed03e3fbc9651b59d32d2a537191a29848f7..1cd35819d2a278421b1b0bf6961c1cfac4dfc865 100644
--- a/chrome/browser/password_manager/chrome_password_manager_client.h
+++ b/chrome/browser/password_manager/chrome_password_manager_client.h
@@ -43,6 +43,7 @@ class ChromePasswordManagerClient
   bool IsAutomaticPasswordSavingEnabled() const override;
   bool IsPasswordManagerEnabledForCurrentPage() const override;
   bool ShouldFilterAutofillResult(const autofill::PasswordForm& form) override;
+  std::string GetSyncUsername() const override;
   bool IsSyncAccountCredential(const std::string& username,
                                const std::string& origin) const override;
   void AutofillResultsComputed() override;
@@ -59,7 +60,8 @@ class ChromePasswordManagerClient
   password_manager::PasswordManagerDriver* GetDriver() override;
   base::FieldTrial::Probability GetProbabilityForExperiment(
       const std::string& experiment_name) override;
-  bool IsPasswordSyncEnabled() override;
+  bool IsPasswordSyncEnabled(
+      password_manager::CustomPassphraseState state) override;
   void OnLogRouterAvailabilityChanged(bool router_can_be_used) override;
   void LogSavePasswordProgress(const std::string& text) override;
   bool IsLoggingActive() const override;