Implement SequencedTaskChecker.

webrtc/base/sequenced_task_checker_impl.cc

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/sequenced_task_checker_impl.h"
+
+#include "webrtc/base/platform_thread.h"
+
+namespace rtc {
+
+SequencedTaskCheckerImpl::SequencedTaskCheckerImpl()
+    : attached_(true), valid_queu_(TaskQueue::Current()) {}
+
+SequencedTaskCheckerImpl::~SequencedTaskCheckerImpl() {}
+
+bool SequencedTaskCheckerImpl::IsCurrent() const {
+  TaskQueue* current_queu = TaskQueue::Current();

[tommi, 2016/07/08 13:15:15]

queue

[perkj_webrtc, 2016/07/11 08:38:00]

Done.

+  CritScope scoped_lock(&lock_);
+  if (!attached_) {  // true if previously detached.
+    valid_queu_ = TaskQueue::Current();

[tommi, 2016/07/08 13:15:15]

valid_queue_ = current_queue;

(since you've already called TaskQueue::Current())

[perkj_webrtc, 2016/07/11 08:38:00]

Done.

+    attached_ = true;
+  }
+  if (!valid_queu_)
+    return thread_checker_.CalledOnValidThread();
+  return valid_queu_ == current_queu;
+}
+
+void SequencedTaskCheckerImpl::Detach() {
+  CritScope scoped_lock(&lock_);
+  attached_ = false;
+  valid_queu_ = nullptr;
+  thread_checker_.DetachFromThread();
+}
+
+}  // namespace rtc