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

chrome/browser/task_management/providers/task_provider_observer.h

Index: chrome/browser/task_management/providers/task_provider_observer.h
diff --git a/chrome/browser/task_management/providers/task_provider_observer.h b/chrome/browser/task_management/providers/task_provider_observer.h
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+++ b/chrome/browser/task_management/providers/task_provider_observer.h
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+// 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_PROVIDERS_TASK_PROVIDER_OBSERVER_H_
+#define CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_TASK_PROVIDER_OBSERVER_H_
+
+#include "chrome/browser/task_management/providers/task.h"
+
+namespace task_management {
+
+// Defines an interface for observing tasks addition / removal.
+class TaskProviderObserver {
+ public:
+  TaskProviderObserver() {}
+  virtual ~TaskProviderObserver() {}
+
+  // This notifies of the event that a new |task| has been created.
+  virtual void TaskAdded(Task* task) = 0;
+
+  // This notifies of the event that a |task| is about to be removed. The task
+  // is still valid during this call, after that it may never be used again by
+  // the observer and references to it must not be kept.
+  virtual void TaskRemoved(Task* task) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TaskProviderObserver);
+};
+
+}  // namespace task_management
+
+#endif  // CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_TASK_PROVIDER_OBSERVER_H_