New Task Manager - Phase 1.1: Implement Browser Process Task Providing

chrome/browser/task_management/private/tasks_providers/task_provider_observer.h

+// Copyright 2015 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 CHROME_BROWSER_TASK_MANAGEMENT_PRIVATE_TASKS_PROVIDERS_TASK_PROVIDER_OBSERVER_H_
+#define CHROME_BROWSER_TASK_MANAGEMENT_PRIVATE_TASKS_PROVIDERS_TASK_PROVIDER_OBSERVER_H_
+
+#include "chrome/browser/task_management/private/tasks_providers/task.h"
+
+namespace task_management {
+
+// Defines an interface for observing tasks addition / removal.
+class TaskProviderObserver {
+ public:
+  TaskProviderObserver() {}
+  virtual ~TaskProviderObserver() {}
+
+  virtual void TaskAdded(const scoped_refptr<Task>& task) = 0;
+  virtual void TaskRemoved(const scoped_refptr<Task>& task) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TaskProviderObserver);
+};
+
+}  // namespace task_management
+
+#endif  // CHROME_BROWSER_TASK_MANAGEMENT_PRIVATE_TASKS_PROVIDERS_TASK_PROVIDER_OBSERVER_H_