[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 61f264412f3532532d227e2b2bc769e3214af04c..80de39cd2a571fc2b5f6118383c55dc87b0ee27f 100644
--- a/chrome/browser/password_manager/chrome_password_manager_client.h
+++ b/chrome/browser/password_manager/chrome_password_manager_client.h
@@ -44,6 +44,7 @@ class ChromePasswordManagerClient
   virtual bool IsPasswordManagerEnabledForCurrentPage() const override;
   virtual bool ShouldFilterAutofillResult(
       const autofill::PasswordForm& form) override;
+  virtual std::string GetSyncUsername() const override;
   virtual bool IsSyncAccountCredential(
       const std::string& username, const std::string& origin) const override;
   virtual void AutofillResultsComputed() override;
@@ -63,7 +64,8 @@ class ChromePasswordManagerClient
   virtual password_manager::PasswordManagerDriver* GetDriver() override;
   virtual base::FieldTrial::Probability GetProbabilityForExperiment(
       const std::string& experiment_name) override;
-  virtual bool IsPasswordSyncEnabled() override;
+  virtual bool IsPasswordSyncEnabled(
+      password_manager::CustomPassphraseState state) override;
   virtual void OnLogRouterAvailabilityChanged(bool router_can_be_used) override;
   virtual void LogSavePasswordProgress(const std::string& text) override;
   virtual bool IsLoggingActive() const override;