Override SigninManager::SignOut if force-signin is enabled.

components/signin/core/browser/signin_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_CLIENT_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_CLIENT_H_
 
 #include "base/callback.h"
 #include "base/callback_list.h"
 #include "base/time/time.h"
@@ skipping 16 matching lines @@
 class URLRequestContextGetter;
 }
 
 // An interface that needs to be supplied to the Signin component by its
 // embedder.
 class SigninClient : public KeyedService {
  public:
   // The subcription for cookie changed notifications.
   class CookieChangedSubscription {
    public:
-    virtual ~CookieChangedSubscription() {};
+    virtual ~CookieChangedSubscription() {}
   };
 
   ~SigninClient() override {}
 
   // If |for_ephemeral| is true, special kind of device ID for ephemeral users
   // is generated.
   static std::string GenerateSigninScopedDeviceID(bool for_ephemeral);
 
   // Sign out.
   void SignOut();
@@ skipping 42 matching lines @@
   virtual void OnSignedIn(const std::string& account_id,
                           const std::string& gaia_id,
                           const std::string& username,
                           const std::string& password) {}
 
   // Called after Google signin has succeeded and GetUserInfo has returned.
   virtual void PostSignedIn(const std::string& account_id,
                             const std::string& username,
                             const std::string& password) {}
 
+  // Called before Google signout started, call |sign_out| to start the sign out
+  // process.
+  virtual void PreSignOut(const base::Callback<void()>& sign_out);
+
   virtual bool IsFirstRun() const = 0;
   virtual base::Time GetInstallDate() = 0;
 
   // Returns true if GAIA cookies are allowed in the content area.
   virtual bool AreSigninCookiesAllowed() = 0;
 
   // Adds an observer to listen for changes to the state of sign in cookie
   // settings.
   virtual void AddContentSettingsObserver(
       content_settings::Observer* observer) = 0;
   virtual void RemoveContentSettingsObserver(
       content_settings::Observer* observer) = 0;
 
   // Execute |callback| if and when there is a network connection.
   virtual void DelayNetworkCall(const base::Closure& callback) = 0;
 
   // Creates and returns a new platform-specific GaiaAuthFetcher. It is the
   // responsability of the caller to delete the returned object.
   virtual GaiaAuthFetcher* CreateGaiaAuthFetcher(
       GaiaAuthConsumer* consumer,
       const std::string& source,
       net::URLRequestContextGetter* getter) = 0;
 
+  // Called once the credentials has been copied to another SigninManager.
+  virtual void AfterCredentialsCopied() {}
+
  protected:
   // Returns device id that is scoped to single signin.
   // Stores the ID in the kGoogleServicesSigninScopedDeviceId pref.
   std::string GetOrCreateScopedDeviceIdPref(PrefService* prefs);
 
  private:
   // Perform Chrome-specific sign out. This happens when user signs out or about
   // to sign in.
   // This method should not be called from the outside of SigninClient. External
   // callers must use SignOut() instead.
   virtual void OnSignedOut() = 0;
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_CLIENT_H_