[GCM] Extracting Delayed Task Controller from GCMDesktopDriver

components/gcm_driver/gcm_delayed_task_controller.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 COMPONENTS_GCM_DRIVER_GCM_DELAYED_TASK_CONTROLLER_H_
+#define COMPONENTS_GCM_DRIVER_GCM_DELAYED_TASK_CONTROLLER_H_
+
+#include <vector>
+
+#include "base/callback.h"
+
+namespace gcm {
+
+// Helper class to save tasks to run until we're ready to execute them.
+class GCMDelayedTaskController {
+ public:
+  GCMDelayedTaskController();
+  ~GCMDelayedTaskController();
+
+  // Adds a task that will be invoked once we're ready.
+  void AddTask(const base::Closure& task);
+
+  // Sets ready status, which will release all of the pending tasks.
+  void SetReady();
+
+  // Returns true if it is ready to perform tasks.
+  bool CanRunTaskWithoutDelay() const;
+
+ private:
+  void RunTasks();
+
+  // Flag that indicates that controlled component is ready.
+  bool ready_;
+
+  std::vector<base::Closure> delayed_tasks_;
+
+  DISALLOW_COPY_AND_ASSIGN(GCMDelayedTaskController);
+};
+
+}  // namespace gcm
+
+#endif  // COMPONENTS_GCM_DRIVER_GCM_DELAYED_TASK_CONTROLLER_H_