Introduce TaskRunner::RunsTasksInCurrentSequence()

ios/web/web_thread_impl.cc

 // Copyright 2014 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 "ios/web/web_thread_impl.h"
 
 #include <string>
 #include <utility>
 
 #include "base/atomicops.h"
@@ skipping 43 matching lines @@
     return WebThread::PostDelayedTask(id_, from_here, std::move(task), delay);
   }
 
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
                                   base::OnceClosure task,
                                   base::TimeDelta delay) override {
     return WebThread::PostNonNestableDelayedTask(id_, from_here,
                                                  std::move(task), delay);
   }
 
-  bool RunsTasksOnCurrentThread() const override {
+  bool RunsTasksInCurrentSequence() const override {
     return WebThread::CurrentlyOn(id_);
   }
 
  protected:
   ~WebThreadTaskRunner() override {}
 
  private:
   WebThread::ID id_;
   DISALLOW_COPY_AND_ASSIGN(WebThreadTaskRunner);
 };
@@ skipping 406 matching lines @@
   AtomicWord* storage =
       reinterpret_cast<AtomicWord*>(&globals.thread_delegates[identifier]);
   AtomicWord old_pointer = base::subtle::NoBarrier_AtomicExchange(
       storage, reinterpret_cast<AtomicWord>(delegate));
 
   // This catches registration when previously registered.
   DCHECK(!delegate || !old_pointer);
 }
 
 }  // namespace web