Add ChildMessageFilter, a base class for renderer/worker cross-thread MessageFilter

content/child/worker_thread_task_runner.cc

+// Copyright 2013 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 "content/child/worker_thread_task_runner.h"
+
+#include "webkit/child/worker_task_runner.h"
+
+using webkit_glue::WorkerTaskRunner;
+
+namespace content {
+
+WorkerThreadTaskRunner::WorkerThreadTaskRunner(int worker_thread_id)
+    : worker_thread_id_(worker_thread_id) {
+}
+
+scoped_refptr<WorkerThreadTaskRunner> WorkerThreadTaskRunner::current() {
+  int worker_thread_id = WorkerTaskRunner::Instance()->CurrentWorkerId();
+  if (!worker_thread_id)
+    return scoped_refptr<WorkerThreadTaskRunner>();
+  return make_scoped_refptr(new WorkerThreadTaskRunner(worker_thread_id));
+}
+
+bool WorkerThreadTaskRunner::PostDelayedTask(
+    const tracked_objects::Location& /* from_here */,
+    const base::Closure& task,
+    base::TimeDelta /* delay */) {

[michaeln, 2013/11/18 17:51:42]

should we assert if delay != 0 for now?

[kinuko, 2013/11/19 04:51:34]

Done.

+  return WorkerTaskRunner::Instance()->PostTask(worker_thread_id_, task);
+}
+
+bool WorkerThreadTaskRunner::RunsTasksOnCurrentThread() const {
+  return worker_thread_id_ == WorkerTaskRunner::Instance()->CurrentWorkerId();
+}
+
+WorkerThreadTaskRunner::~WorkerThreadTaskRunner() {}
+
+}  // namespace content