Make ThreadChecker::CalledOnValidThread() return true when called from the same task.

base/sequence_token.cc

-// Copyright 2016 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.
-
-#include "base/sequence_token.h"
-
-#include "base/atomic_sequence_num.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/threading/thread_local.h"
-
-namespace base {
-
-namespace {
-
-base::StaticAtomicSequenceNumber g_sequence_token_generator;
-
-LazyInstance<ThreadLocalPointer<ScopedSetSequenceTokenForCurrentThread>>::Leaky
-    tls_current_sequence_token = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-bool SequenceToken::operator==(const SequenceToken& other) const {
-  return token_ == other.token_ && token_ != kInvalidSequenceToken;
-}
-
-bool SequenceToken::operator!=(const SequenceToken& other) const {
-  return !(*this == other);
-}
-
-bool SequenceToken::IsValid() const {
-  return token_ != kInvalidSequenceToken;
-}
-
-SequenceToken SequenceToken::Create() {
-  return SequenceToken(g_sequence_token_generator.GetNext());
-}
-
-SequenceToken SequenceToken::GetForCurrentThread() {
-  const ScopedSetSequenceTokenForCurrentThread* current_sequence_token =
-      tls_current_sequence_token.Get().Get();
-  return current_sequence_token ? current_sequence_token->token_
-                                : SequenceToken();
-}
-
-ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread(
-    const SequenceToken& token)
-    : token_(token) {
-  DCHECK(!tls_current_sequence_token.Get().Get());
-  tls_current_sequence_token.Get().Set(this);
-}
-
-ScopedSetSequenceTokenForCurrentThread::
-    ~ScopedSetSequenceTokenForCurrentThread() {
-  DCHECK_EQ(tls_current_sequence_token.Get().Get(), this);
-  tls_current_sequence_token.Get().Set(nullptr);
-}
-
-}  // namespace base