[Easy signin] Wire up userClick auth attempt to easy unlock app and back

chrome/browser/signin/screenlock_bridge.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 CHROME_BROWSER_SIGNIN_SCREENLOCK_BRIDGE_H_
 #define CHROME_BROWSER_SIGNIN_SCREENLOCK_BRIDGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "base/values.h"
 
 
 class Profile;
 
 // ScreenlockBridge brings together the screenLockPrivate API and underlying
 // support. On ChromeOS, it delegates calls to the ScreenLocker. On other
 // platforms, it delegates calls to UserManagerUI (and friends).
+// TODO(tbarzic): Rename ScreenlockBridge to SignInScreenBridge, as this is not
+// used solely for the lock screen anymore.
 class ScreenlockBridge {
  public:
   class Observer {
    public:
     // Invoked after the screen is locked.
     virtual void OnScreenDidLock() = 0;
     // Invoked after the screen lock is dismissed.
     virtual void OnScreenDidUnlock() = 0;
     // Invoked when the user focused on the lock screen changes.
     virtual void OnFocusedUserChanged(const std::string& user_id) = 0;
@@ skipping 92 matching lines @@
     virtual void SetAuthType(const std::string& user_email,
                              AuthType auth_type,
                              const base::string16& auth_value) = 0;
 
     // Returns the authentication type used for a user.
     virtual AuthType GetAuthType(const std::string& user_email) const = 0;
 
     // Unlock from easy unlock app for a user.
     virtual void Unlock(const std::string& user_email) = 0;
 
+    // Attempts to login the user using an easy unlock key.
+    virtual void AttemptEasySignin(const std::string& user_email,
+                                   const std::string& secret,
+                                   const std::string& key_label) = 0;
+
    protected:
     virtual ~LockHandler() {}
   };
 
   static ScreenlockBridge* Get();
   static std::string GetAuthenticatedUserEmail(Profile* profile);
 
   void SetLockHandler(LockHandler* lock_handler);
   void SetFocusedUser(const std::string& user_id);
 
@@ skipping 17 matching lines @@
 
   LockHandler* lock_handler_;  // Not owned
   // The last focused user's id.
   std::string focused_user_id_;
   ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockBridge);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SCREENLOCK_BRIDGE_H_