Make new TaskRunner, SequencedTaskRunner, and SingleThreadTaskRunner interfaces

base/message_loop_proxy_impl.cc

Index: base/message_loop_proxy_impl.cc
diff --git a/base/message_loop_proxy_impl.cc b/base/message_loop_proxy_impl.cc
index dd20b39dd34a36e10c4832d9528fdccfa21e28d8..ef95397fffc8d5734ed6eb613e73a2e14c8d7686 100644
--- a/base/message_loop_proxy_impl.cc
+++ b/base/message_loop_proxy_impl.cc
@@ -36,7 +36,7 @@ bool MessageLoopProxyImpl::PostNonNestableDelayedTask(
   return PostTaskHelper(from_here, task, delay_ms, false);
 }
 
-bool MessageLoopProxyImpl::BelongsToCurrentThread() {
+bool MessageLoopProxyImpl::MayRunTasksOnCurrentThread() const {
   // We shouldn't use MessageLoop::current() since it uses LazyInstance which
   // may be deleted by ~AtExitManager when a WorkerPool thread calls this
   // function.