Adding mojo calls for easy unlock service

ash/public/interfaces/lock_screen.mojom

 // Copyright 2017 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.
 
 module ash.mojom;
 
 import "components/signin/public/interfaces/account_id.mojom";
+import "mojo/common/values.mojom";
 
 // Allows clients (e.g. Chrome browser) to control the ash lock screen.
 interface LockScreen {
   // Sets the client interface.
   SetClient(LockScreenClient client);
 
   // Requests to show error message in the ash lock screen.
   // TODO(xiaoyinh): login_attempts is probabaly not needed from chrome,
   // remove it when we start to count the login attempts in ash lock screen.
   // |login_attempts|: The number of the login authentication attempts.
   // |error_text|:     The error text to be shown in lock screen.
   // |help_link_text|: The help link to be shown in lock screen.
   // |help_topic_id|:  The id of the help app topic regarding this error.
   ShowErrorMessage(int32 login_attempts,
                    string error_text,
                    string help_link_text,
                    int32 help_topic_id);
 
   // Requests to close any displayed error messages in ash lock screen.
   ClearErrors();
+
+  // Requests to show the custom icon in the user pod.
+  // |account_id|:  The account id of the user in the user pod.
+  // |icon|:        Information regarding the icon.     
+  ShowUserPodCustomIcon(signin.mojom.AccountId account_id,
+                        mojo.common.mojom.DictionaryValue icon);

[xiyuan, 2017/05/31 17:51:18]

Can we create mojo struct for ScreenlockBridge::UserPodCustomIconOptions and use
it here? We are do it in a separate prep CL.

[xiaoyinh(OOO Sep 11-29), 2017/06/02 23:42:28]

Done.

+
+  // Requests to hide the custom icon in the user pod.
+  // |account_id|:  The account id of the user in the user pod.
+  HideUserPodCustomIcon(signin.mojom.AccountId account_id);
+
+  // Requests to set the authentication type.
+  // |account_id|:    The account id of the user in the user pod.
+  // |auth_type|:     Authentication type.
+  // |initial_value|: A message shown in the password field of the user pod. 
+  SetAuthType(signin.mojom.AccountId account_id,
+              int32 auth_type,

[xiyuan, 2017/05/31 17:51:18]

Create a mojo enum and use it here?

[xiaoyinh(OOO Sep 11-29), 2017/06/02 23:42:28]

Done.

+              string initial_value);
+  
+  // Requests to load users in the lock screen.
+  // |users|:      A list of users who can unlock the device.
+  // |show_guest|: Whether to show guest session button.
+  LoadUsers(mojo.common.mojom.ListValue users, bool show_guest);

[xiyuan, 2017/05/31 17:51:18]

Similar here, prefer to have a array<some_struct> for users.

[jdufault, 2017/05/31 22:54:00]

ie, ash.mojom.UserInfo

[xiaoyinh(OOO Sep 11-29), 2017/06/02 23:42:28]

Thanks for the suggestion. Each user in |users| has about 20+ fields of
information which I'm not sure if these are all applicable for the new
view-based UI. I've added a TODO to convert it to a mojom struct later.  

 };
 
 // Allows ash lock screen to control a client (e.g. Chrome browser). Requests
 // often involve preferences or talk to cryptohome that is not available to ash.
 interface LockScreenClient {
   // Request user authentication in chrome.
   // If auth succeeds:
   // chrome will hide the lock screen and clear any displayed error messages.
   // If auth fails:
   // chrome will request lock screen to show error messages.
   // |account_id|:           The account id of the user we are authenticating.
   // |hashed_password|:      The hashed password of the user.
   // |authenticated_by_pin|: True if we are using pin to authenticate.
   AuthenticateUser(signin.mojom.AccountId account_id,
                    string hashed_password,
                    bool authenticated_by_pin);
+
+  // Request to attempt easy unlock in chrome.
+  // |account_id|:   The account id of the user we are authenticating.
+  AttemptUnlock(signin.mojom.AccountId account_id);
+
+  // Request to hard lock the user pod.
+  // |account_id|:    The account id of the user in the user pod.
+  HardlockPod(signin.mojom.AccountId account_id);
+
+  // Record clicks on the lock icon in the user pod.
+  // |account_id|:    The account id of the user in the user pod.
+  RecordClickOnLockIcon(signin.mojom.AccountId account_id);
 };