CleanUp: Introduce UserInfo. Move session_state stuff to ash/session.

ash/session/user_info.h

Index: ash/session/user_info.h
diff --git a/ash/session/user_info.h b/ash/session/user_info.h
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+++ b/ash/session/user_info.h
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+// 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 ASH_SESSION_USER_INFO_H_
+#define ASH_SESSION_USER_INFO_H_
+
+#include <string>
+
+#include "ash/ash_export.h"
+#include "base/strings/string16.h"
+
+namespace gfx {
+class ImageSkia;
+}
+
+namespace ash {
+
+// A class that represents user related info.
+class ASH_EXPORT UserInfo {
+ public:
+  virtual ~UserInfo() {}
+
+  // Gets the display name for the user.
+  virtual base::string16 GetDisplayName() const = 0;
+
+  // Gets the given name of the user.
+  virtual base::string16 GetGivenName() const = 0;
+
+  // Gets the display email address for the user.
+  // The display email address might contains some periods in the email name
+  // as well as capitalized letters. For example: "Foo.Bar@mock.com".
+  virtual std::string GetEmail() const = 0;
+
+  // Gets the user id (sanitized email address) for the user.
+  // The function would return something like "foobar@mock.com".
+  virtual std::string GetUserID() const = 0;
+
+  // Gets the avatar image for the user.
+  virtual const gfx::ImageSkia& GetImage() const = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_SESSION_USER_INFO_H_