Move task_queue.* to base because it makes more sense there.

TEST=base_test --gtest_filter=TaskQueue*.* (added in this patch).
BUG=38475

Review URL: http://codereview.chromium.org/3205004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57479 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/base/task_queue.h b/base/task_queue.h
new file mode 100644
index 0000000..5bfc777
--- /dev/null
+++ b/base/task_queue.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2010 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 BASE_TASK_QUEUE_H_
+#define BASE_TASK_QUEUE_H_
+#pragma once
+
+#include <deque>
+
+#include "base/task.h"
+
+// A TaskQueue is a queue of tasks waiting to be run.  To run the tasks, call
+// the Run method.  A task queue is itself a Task so that it can be placed in a
+// message loop or another task queue.
+class TaskQueue : public Task {
+ public:
+  TaskQueue();
+  ~TaskQueue();
+
+  // Run all the tasks in the queue.  New tasks pushed onto the queue during
+  // a run will be run next time |Run| is called.
+  virtual void Run();
+
+  // Push the specified task onto the queue.  When the queue is run, the tasks
+  // will be run in the order they are pushed.
+  //
+  // This method takes ownership of |task| and will delete task after it is run
+  // (or when the TaskQueue is destroyed, if we never got a chance to run it).
+  void Push(Task* task);
+
+  // Remove all tasks from the queue.  The tasks are deleted.
+  void Clear();
+
+  // Returns true if this queue contains no tasks.
+  bool IsEmpty() const;
+
+ private:
+   // The list of tasks we are waiting to run.
+   std::deque<Task*> queue_;
+};
+
+#endif  // BASE_TASK_QUEUE_H_