arc: Pass auth token from Chrome to ARC instance.

components/arc/opt_in/arc_opt_in_manager.h

+// Copyright 2016 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 COMPONENTS_ARC_OPT_IN_ARC_OPT_IN_MANAGER_H_
+#define COMPONENTS_ARC_OPT_IN_ARC_OPT_IN_MANAGER_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+class Profile;
+
+namespace arc {
+
+class ArcOptInManager {

[lhc(google), 2016/01/22 22:18:33]

The only implementation that exists is ArcOptInManagerImpl. You should be able
to remove this completely and rename ArcOptInManagerImpl to ArcOptInManager.

[khmel, 2016/01/23 00:41:43]

Done.

+ public:
+  enum class State {
+    DISABLE,  // ARC is not allowed to run (default).
+    FETCHING_TOKEN,  // ARC is allowed, receiving  auth_2 token.
+    NO_TOKEN,  // ARC is allowed, auth_2 token was not received.
+    ENABLE,  // ARC is allowed, auth_2 token was received.
+  };
+
+  class Observer {
+   public:
+    // Called whenever Opt-In state of the ARC has been changed.
+    virtual void OnOptInChanged(State state) = 0;
+  };
+
+  virtual ~ArcOptInManager() {}
+
+  virtual void SetProfile(Profile* profile) = 0;
+
+  virtual State state() const = 0;

[lhc(google), 2016/01/22 22:18:33]

Only inlined trivial functions can be lowercase. Either have an inline
definition or make this GetState().

[khmel, 2016/01/23 00:41:43]

Done.

+
+  // Sets the auth token. Can be set from internally or from external component
+  // that accepts user's credentials. This actually starts ARC bridge service.
+  virtual void SetAuthTokenAndStartArc(const std::string auth_token) = 0;
+
+  // Returns the auth token. For security reason this token can be used only
+  // once and exists for specific period of time.
+  virtual std::string GetAuthToken() = 0;
+
+  // Adds or removes observers.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+ protected:
+  ArcOptInManager() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArcOptInManager);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_OPT_IN_ARC_OPT_IN_MANAGER_H_