Revert 194589 "Revert 194578 "Add ash SessionStateDelegate""

The CL turned out to be innocent, the bots turned green without the revert.

> Revert 194578 "Add ash SessionStateDelegate"
> 
> > Add ash SessionStateDelegate
> > 
> > This CL refactors the ShellDelegate by adding a SessionStateDelegate to
> > which methods dealing with the session state can be moved. This cleans up
> > the huge ShellDelegate interface and paves the way for further Chrome OS
> > multiprofile work which will need to add several new methods related to
> > the session state.
> > 
> > This CL is only the first step. Several other methods should also move to
> > SessionStateDelegate but I do not want to overburden a single CL.
> > 
> > BUG=None
> > TEST=Manual and browser/unit tests
> > 
> > TBR=sky (for c/b/idle_chromeos.cc and c/chrome_browser_ui.gypi)
> > 
> > Review URL: https://codereview.chromium.org/14295008
> 
> TBR=bartfab@google.com
> 
> Review URL: https://codereview.chromium.org/14200034

TBR=gavinp@chromium.org

Review URL: https://codereview.chromium.org/14200038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194602 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 41 insertions, 0 deletions

diff --git a/ash/session_state_delegate.h b/ash/session_state_delegate.h
new file mode 100644
index 0000000..f5ee359
--- /dev/null
+++ b/ash/session_state_delegate.h
@@ -0,0 +1,41 @@
+// Copyright (c) 2013 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 ASH_SESSION_STATE_DELEGATE_H_
+#define ASH_SESSION_STATE_DELEGATE_H_
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+// Delegate for checking and modifying the session state.
+class ASH_EXPORT SessionStateDelegate {
+ public:
+  virtual ~SessionStateDelegate() {};
+
+  // Returns |true| if a session is in progress and there is an active user.
+  virtual bool HasActiveUser() const = 0;
+
+  // Returns |true| if the session has been fully started for the active user.
+  // When a user becomes active, the profile and browser UI are not immediately
+  // available. Only once this method starts returning |true| is the browser
+  // startup complete and both profile and UI are fully available.
+  virtual bool IsActiveUserSessionStarted() const = 0;
+
+  // Returns true if the screen can be locked.
+  virtual bool CanLockScreen() const = 0;
+
+  // Returns true if the screen is currently locked.
+  virtual bool IsScreenLocked() const = 0;
+
+  // Locks the screen. The locking happens asynchronously.
+  virtual void LockScreen() = 0;
+
+  // Unlocks the screen.
+  virtual void UnlockScreen() = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_SESSION_STATE_DELEGATE_H_