cros: Use SessionController to enable system tray settings / notifications tray

chrome/browser/chromeos/login/user_flow.h

 // Copyright (c) 2012 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_CHROMEOS_LOGIN_USER_FLOW_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_FLOW_H_
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chromeos/login/auth/auth_status_consumer.h"
@@ skipping 11 matching lines @@
  public:
   UserFlow();
   virtual ~UserFlow() = 0;
 
   // Provides ability to alter command line before session has started.
   virtual void AppendAdditionalCommandLineSwitches() = 0;
 
   // Indicates if screen locking should be enabled or disabled for a flow.
   virtual bool CanLockScreen() = 0;
   virtual bool CanStartArc() = 0;
-  virtual bool ShouldShowSettings() = 0;
+
+  // Whether or not the settings icon should be enabled in the system tray menu.
+  virtual bool ShouldEnableSettings() = 0;
+
+  // Whether or not the notifications tray should be visible.
   virtual bool ShouldShowNotificationTray() = 0;
+
   virtual bool ShouldLaunchBrowser() = 0;
   virtual bool ShouldSkipPostLoginScreens() = 0;
   virtual bool SupportsEarlyRestartToApplyFlags() = 0;
   virtual bool HandleLoginFailure(const AuthFailure& failure) = 0;
   virtual void HandleLoginSuccess(const UserContext& context) = 0;
   virtual bool HandlePasswordChangeDetected() = 0;
   virtual void HandleOAuthTokenStatusChange(
       user_manager::User::OAuthTokenStatus status) = 0;
   virtual void LaunchExtraSteps(Profile* profile) = 0;
   void SetHost(LoginDisplayHost* host);
 
   LoginDisplayHost* host() {
     return host_;
   }
 
  private:
   LoginDisplayHost* host_;
 };
 
 // UserFlow implementation for regular login flow.
 class DefaultUserFlow : public UserFlow {
  public:
   ~DefaultUserFlow() override;
 
+  // UserFlow:
   void AppendAdditionalCommandLineSwitches() override;
   bool CanLockScreen() override;
   bool CanStartArc() override;
-  bool ShouldShowSettings() override;
+  bool ShouldEnableSettings() override;
   bool ShouldShowNotificationTray() override;
   bool ShouldLaunchBrowser() override;
   bool ShouldSkipPostLoginScreens() override;
   bool SupportsEarlyRestartToApplyFlags() override;
   bool HandleLoginFailure(const AuthFailure& failure) override;
   void HandleLoginSuccess(const UserContext& context) override;
   bool HandlePasswordChangeDetected() override;
   void HandleOAuthTokenStatusChange(
       user_manager::User::OAuthTokenStatus status) override;
   void LaunchExtraSteps(Profile* profile) override;
 };
 
 // UserFlow stub for non-regular flows.
 class ExtendedUserFlow : public UserFlow {
  public:
   explicit ExtendedUserFlow(const AccountId& account_id);
   ~ExtendedUserFlow() override;
 
+  // UserFlow:
   void AppendAdditionalCommandLineSwitches() override;
-  bool ShouldShowSettings() override;
+  bool ShouldEnableSettings() override;
   bool ShouldShowNotificationTray() override;
   void HandleOAuthTokenStatusChange(
       user_manager::User::OAuthTokenStatus status) override;
 
  protected:
   // Subclasses can call this method to unregister flow in the next event.
   virtual void UnregisterFlowSoon();
   const AccountId& account_id() { return account_id_; }
 
  private:
   const AccountId account_id_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_FLOW_H_