Created paring flow interface for controller side.

ui/chromeos/pairing/controller_pairing_flow.h

+// 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 UI_CHROMEOS_PAIRING_CONTROLLER_PAIRING_FLOW_H_
+#define UI_CHROMEOS_PAIRING_CONTROLLER_PAIRING_FLOW_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "ui/chromeos/ui_chromeos_export.h"
+
+namespace chromeos {
+class UserContext;
+}
+
+namespace content {
+class BrowserContext;
+}
+
+namespace ui {
+
+class UI_CHROMEOS_EXPORT ControllerPairingFlow {
+ public:
+  enum Stage {
+    STAGE_NONE,
+    STAGE_SCANNING_FOR_DEVICES,
+    STAGE_DEVICE_NOT_FOUND,
+    STAGE_WAITING_FOR_DEVICE_SELECTION,
+    STAGE_ESTABLISHING_CONNECTION,
+    STAGE_WATING_FOR_CODE_CONFIRMATION,
+    STAGE_HOST_UPDATE_IN_PROGRESS,
+    STAGE_HOST_CONNECTION_LOST,
+    STAGE_WAITING_FOR_CREDENTIALS,
+    STAGE_HOST_ENROLLMENT_IN_PROGRESS,
+    STAGE_HOST_ENROLLMENT_ERROR,
+    STAGE_PAIRING_DONE,
+    STAGE_STARTING_SESSION,
+    STAGE_FINISHED
+  };
+
+  class Observer {
+   public:
+    virtual ~Observer() {};
+
+    // Called when flow has moved on from one stage to another.
+    virtual void PairingStageChanged(Stage previous_stage, Stage new_stage) = 0;

[Zachary Kuznia, 2014/05/27 23:46:43]

Why do you expect the previous stage to be sent here?  Shouldn't the observer
already know that?

[dzhioev (left Google), 2014/05/28 10:38:30]

Yes, probably |previous_stage| is excess.

+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Observer);
+  };
+
+ public:
+  virtual ~ControllerPairingFlow() {}
+
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+  // Returns current stage of flow.
+  virtual Stage GetCurrentStage() = 0;
+
+  // Starts pairing flow. Can be called only on |STAGE_NONE| stage.
+  virtual void StartFlow() = 0;
+
+  // Rescan for devices to pair with. Can be called only on
+  // |STAGE_DEVICE_NOT_FOUND| stage.
+  virtual void RepeatScanning() = 0;
+
+  // Called to confirm or deny confirmation code. Can be called only on
+  // |STAGE_WAITING_FOR_CODE_CONFIRMATION| stage.
+  virtual void SetConfirmationCodeIsRight(bool right) = 0;
+
+  // Called when user successfully authenticated on GAIA page. Can be called
+  // only on |STAGE_WAITING_FOR_CREDENTIALS|.
+  virtual void OnAuthenticationDone(
+      const chromeos::UserContext& user_context,
+      content::BrowserContext* browser_context) = 0;
+
+  // Installs app and starts session.
+  // Can be called only on |STAGE_PAIRING_DONE| stage.
+  virtual void StartSession() = 0;
+
+  // Returns pairing confirmation code.
+  // Could be called only on |STATE_WAITING_FOR_CODE_CONFIRMATION| stage.
+  virtual std::string GetConfirmationCode() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ControllerPairingFlow);
+};
+
+}  // namespace ui
+
+#endif  // UI_CHROMEOS_PAIRING_CONTROLLER_PAIRING_FLOW_H_